1051 lines
42 KiB
Groff
1051 lines
42 KiB
Groff
.\" You can view this file with:
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.\" nroff -man curl.1
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.\" Written by Daniel Stenberg
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.\"
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.TH curl 1 "8 Aug 2003" "Curl 7.10.7" "Curl Manual"
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.SH NAME
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curl \- transfer a URL
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.SH SYNOPSIS
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.B curl [options]
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.I [URL...]
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.SH DESCRIPTION
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.B curl
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is a tool to transfer data from or to a server, using one of the supported
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protocols (HTTP, HTTPS, FTP, FTPS, GOPHER, DICT, TELNET, LDAP or FILE). The
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command is designed to work without user interaction.
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curl offers a busload of useful tricks like proxy support, user
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authentication, ftp upload, HTTP post, SSL (https:) connections, cookies, file
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transfer resume and more. As you will see below, the amount of features will
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make your head spin!
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curl is powered by libcurl for all transfer-related features. See
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.BR libcurl (3)
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for details.
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.SH URL
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The URL syntax is protocol dependent. You'll find a detailed description in
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RFC 2396.
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You can specify multiple URLs or parts of URLs by writing part sets within
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braces as in:
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http://site.{one,two,three}.com
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or you can get sequences of alphanumeric series by using [] as in:
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ftp://ftp.numericals.com/file[1-100].txt
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ftp://ftp.numericals.com/file[001-100].txt (with leading zeros)
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ftp://ftp.letters.com/file[a-z].txt
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It is possible to specify up to 9 sets or series for a URL, but no nesting is
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supported at the moment:
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http://www.any.org/archive[1996-1999]/volume[1-4]part{a,b,c,index}.html
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You can specify any amount of URLs on the command line. They will be fetched
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in a sequential manner in the specified order.
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Curl will attempt to re-use connections for multiple file transfers, so that
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getting many files from the same server will not do multiple connects /
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handshakes. This improves speed. Of course this is only done on files
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specified on a single command line and cannot be used between separate curl
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invokes.
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.SH OPTIONS
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.IP "-a/--append"
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(FTP) When used in an FTP upload, this will tell curl to append to the target
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file instead of overwriting it. If the file doesn't exist, it will be created.
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If this option is used twice, the second one will disable append mode again.
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.IP "-A/--user-agent <agent string>"
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(HTTP)
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Specify the User-Agent string to send to the HTTP server. Some badly done CGIs
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fail if its not set to "Mozilla/4.0". To encode blanks in the string,
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surround the string with single quote marks. This can also be set with the
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-H/--header flag of course.
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If this option is set more than once, the last one will be the one that's
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used.
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.IP "--anyauth"
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(HTTP) Tells curl to figure out authentication method by itself, and use the
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most secure one the remote site claims it supports. This is done by first
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doing a request and checking the response-headers, thus inducing an extra
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network round-trip. This is used instead of setting a specific authentication
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method, which you can do with \fI--digest\fP, \fI--ntlm\fP, and
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\fI--negotiate\fP. (Added in 7.10.6)
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If this option is used several times, the following occurrences make no
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difference.
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.IP "-b/--cookie <name=data>"
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(HTTP)
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Pass the data to the HTTP server as a cookie. It is supposedly the
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data previously received from the server in a "Set-Cookie:" line.
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The data should be in the format "NAME1=VALUE1; NAME2=VALUE2".
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If no '=' letter is used in the line, it is treated as a filename to use to
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read previously stored cookie lines from, which should be used in this session
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if they match. Using this method also activates the "cookie parser" which will
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make curl record incoming cookies too, which may be handy if you're using this
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in combination with the -L/--location option. The file format of the file to
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read cookies from should be plain HTTP headers or the Netscape/Mozilla cookie
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file format.
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.B NOTE
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that the file specified with -b/--cookie is only used as input. No cookies
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will be stored in the file. To store cookies, save the HTTP headers to a file
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using -D/--dump-header!
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If this option is set more than once, the last one will be the one that's
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used.
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.IP "-B/--use-ascii"
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Use ASCII transfer when getting an FTP file or LDAP info. For FTP, this can
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also be enforced by using an URL that ends with ";type=A". This option causes
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data sent to stdout to be in text mode for win32 systems.
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If this option is used twice, the second one will disable ASCII usage.
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.IP "--basic"
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(HTTP) Tells curl to use HTTP Basic authentication. This is the default and
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this option is usually pointless, unless you use it to override a previously
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set option that sets a different authentication method (such as \fI--ntlm\fP,
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\fI--digest\fP and \fI--negotiate\fP). (Added in 7.10.6)
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If this option is used several times, the following occurrences make no
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difference.
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.IP "--ciphers <list of ciphers>"
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(SSL) Specifies which ciphers to use in the connection. The list of ciphers
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must be using valid ciphers. Read up on SSL cipher list details on this URL:
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.I http://www.openssl.org/docs/apps/ciphers.html
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If this option is used several times, the last one will override the others.
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.IP "--compressed"
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(HTTP) Request a compressed response using one of the algorithms libcurl
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supports, and return the uncompressed document. If this option is used and
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the server sends an unsupported encoding, Curl will report an error.
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If this option is used several times, each occurrence will toggle it on/off.
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.IP "--connect-timeout <seconds>"
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Maximum time in seconds that you allow the connection to the server to take.
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This only limits the connection phase, once curl has connected this option is
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of no more use. See also the \fI--max-time\fP option.
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If this option is used several times, the last one will be used.
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.IP "-c/--cookie-jar <file name>"
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Specify to which file you want curl to write all cookies after a completed
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operation. Curl writes all cookies previously read from a specified file as
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well as all cookies received from remote server(s). If no cookies are known,
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no file will be written. The file will be written using the Netscape cookie
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file format. If you set the file name to a single dash, "-", the cookies will
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be written to stdout.
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.B NOTE
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If the cookie jar can't be created or written to, the whole curl operation
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won't fail or even report an error clearly. Using -v will get a warning
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displayed, but that is the only visible feedback you get about this possibly
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lethal situation.
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If this option is used several times, the last specfied file name will be
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used.
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.IP "-C/--continue-at <offset>"
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Continue/Resume a previous file transfer at the given offset. The given offset
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is the exact number of bytes that will be skipped counted from the beginning
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of the source file before it is transfered to the destination. If used with
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uploads, the ftp server command SIZE will not be used by curl.
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Use "-C -" to tell curl to automatically find out where/how to resume the
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transfer. It then uses the given output/input files to figure that out.
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If this option is used several times, the last one will be used.
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.IP "--create-dirs"
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When used in conjunction with the -o option, curl will create the necessary
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local directory hierarchy as needed.
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.IP "--crlf"
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(FTP) Convert LF to CRLF in upload. Useful for MVS (OS/390).
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If this option is used twice, the second will again disable crlf converting.
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.IP "-d/--data <data>"
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(HTTP) Sends the specified data in a POST request to the HTTP server, in a way
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that can emulate as if a user has filled in a HTML form and pressed the submit
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button. Note that the data is sent exactly as specified with no extra
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processing (with all newlines cut off). The data is expected to be
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\&"url-encoded". This will cause curl to pass the data to the server using the
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content-type application/x-www-form-urlencoded. Compare to -F. If more than
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one -d/--data option is used on the same command line, the data pieces
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specified will be merged together with a separating &-letter. Thus, using '-d
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name=daniel -d skill=lousy' would generate a post chunk that looks like
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\&'name=daniel&skill=lousy'.
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If you start the data with the letter @, the rest should be a file name to
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read the data from, or - if you want curl to read the data from stdin. The
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contents of the file must already be url-encoded. Multiple files can also be
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specified. Posting data from a file named 'foobar' would thus be done with
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\&"--data @foobar".
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To post data purely binary, you should instead use the --data-binary option.
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-d/--data is the same as --data-ascii.
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If this option is used several times, the ones following the first will
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append data.
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.IP "--data-ascii <data>"
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(HTTP) This is an alias for the -d/--data option.
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If this option is used several times, the ones following the first will
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append data.
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.IP "--data-binary <data>"
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(HTTP) This posts data in a similar manner as --data-ascii does, although when
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using this option the entire context of the posted data is kept as-is. If you
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want to post a binary file without the strip-newlines feature of the
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--data-ascii option, this is for you.
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If this option is used several times, the ones following the first will
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append data.
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.IP "--digest"
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(HTTP) Enables HTTP Digest authentication. This is a authentication that
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prevents the password from being sent over the wire in clear text. Use this in
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combination with the normal -u/--user option to set user name and
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password. See also \fI--ntlm\fP, \fP--negotiate\fI and \fI--anyauth\fP for
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related options. (Added in curl 7.10.6)
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If this option is used several times, the following occurrences make no
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difference.
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.IP "--disable-eprt"
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(FTP) Tell curl to disable the use of the EPRT and LPRT commands when doing
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active FTP transfers. Curl will normally always first attempt to use EPRT,
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then LPRT before using PORT, but with this option, it will use PORT right
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away. EPRT and LPRT are extensions to the original FTP protocol, may not work
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on all servers but enable more functionality in a better way than the
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traditional PORT command. (Aded in 7.10.5)
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If this option is used several times, each occurrence will toggle this on/off.
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.IP "--disable-epsv"
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(FTP) Tell curl to disable the use of the EPSV command when doing passive FTP
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transfers. Curl will normally always first attempt to use EPSV before PASV,
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but with this option, it will not try using EPSV.
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If this option is used several times, each occurrence will toggle this on/off.
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.IP "-D/--dump-header <file>"
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Write the protocol headers to the specified file.
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This option is handy to use when you want to store the cookies that a HTTP
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site sends to you. The cookies could then be read in a second curl invoke by
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using the -b/--cookie option!
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When used on FTP, the ftp server response lines are considered being "headers"
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and thus are saved there.
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If this option is used several times, the last one will be used.
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.IP "-e/--referer <URL>"
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(HTTP) Sends the "Referer Page" information to the HTTP server. This can also
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be set with the -H/--header flag of course. When used with
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.I -L/--location
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you can append ";auto" to the referer URL to make curl automatically set the
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previous URL when it follows a Location: header. The ";auto" string can be
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used alone, even if you don't set an initial referer.
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If this option is used several times, the last one will be used.
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.IP "--environment"
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(RISC OS ONLY) Sets a range of environment variables, using the names the -w
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option supports, to easier allow extraction of useful information after having
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run curl.
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If this option is used several times, each occurrence will toggle this on/off.
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.IP "--egd-file <file>"
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(HTTPS) Specify the path name to the Entropy Gathering Daemon socket. The
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socket is used to seed the random engine for SSL connections. See also the
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.I "--random-file"
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option.
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.IP "-E/--cert <certificate[:password]>"
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(HTTPS)
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Tells curl to use the specified certificate file when getting a file
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with HTTPS. The certificate must be in PEM format.
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If the optional password isn't specified, it will be queried for on
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the terminal. Note that this certificate is the private key and the private
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certificate concatenated!
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If this option is used several times, the last one will be used.
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.IP "--cacert <CA certificate>"
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(HTTPS) Tells curl to use the specified certificate file to verify the
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peer. The file may contain multiple CA certificates. The certificate(s) must
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be in PEM format.
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curl recognizes the environment variable named 'CURL_CA_BUNDLE' if that is
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set, and uses the given path as a path to a CA cert bundle. This option
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overrides that variable.
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The windows version of curl will automatically look for a CA certs file named
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\'curl-ca-bundle.crt\', either in the same directory as curl.exe, or in the
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Current Working Directory, or in any folder along your PATH.
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If this option is used several times, the last one will be used.
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.IP "--capath <CA certificate directory>"
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(HTTPS) Tells curl to use the specified certificate directory to verify the
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peer. The certificates must be in PEM format, and the directory must have been
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processed using the c_rehash utility supplied with openssl. Using --capath can
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allow curl to make https connections much more efficiently than using --cacert
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if the --cacert file contains many CA certificates.
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If this option is used several times, the last one will be used.
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.IP "-f/--fail"
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(HTTP) Fail silently (no output at all) on server errors. This is mostly done
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like this to better enable scripts etc to better deal with failed attempts. In
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normal cases when a HTTP server fails to deliver a document, it returns a HTML
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document stating so (which often also describes why and more). This flag will
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prevent curl from outputting that and fail silently instead.
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If this option is used twice, the second will again disable silent failure.
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.IP "--ftp-create-dirs"
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(FTP) When an FTP URL/operation uses a path that doesn't currently exist on
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the server, the standard behaviour of curl is to fail. Using this option, curl
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will instead attempt to create missing directories. (Added in 7.10.7)
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If this option is used twice, the second will again disable silent failure.
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.IP "-F/--form <name=content>"
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(HTTP) This lets curl emulate a filled in form in which a user has pressed the
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submit button. This causes curl to POST data using the content-type
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multipart/form-data according to RFC1867. This enables uploading of binary
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files etc. To force the 'content' part to be be a file, prefix the file name
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with an @ sign. To just get the content part from a file, prefix the file name
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with the letter <. The difference between @ and < is then that @ makes a file
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get attached in the post as a file upload, while the < makes a text field and
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just get the contents for that text field from a file.
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Example, to send your password file to the server, where
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\&'password' is the name of the form-field to which /etc/passwd will be the
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input:
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\fBcurl\fP -F password=@/etc/passwd www.mypasswords.com
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To read the file's content from stdin insted of a file, use - where the file
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name should've been. This goes for both @ and < constructs.
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You can also tell curl what Content-Type to use for the file upload part, by
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using 'type=', in a manner similar to:
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\fBcurl\fP -F "web=@index.html;type=text/html" url.com
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See further examples and details in the MANUAL.
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This option can be used multiple times.
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.IP "-g/--globoff"
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This option switches off the "URL globbing parser". When you set this option,
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you can specify URLs that contain the letters {}[] without having them being
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interpreted by curl itself. Note that these letters are not normal legal URL
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contents but they should be encoded according to the URI standard.
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.IP "-G/--get"
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When used, this option will make all data specified with -d/--data or
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--data-binary to be used in a HTTP GET request instead of the POST request
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that otherwise would be used. The data will be appended to the URL with a '?'
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separator.
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If used in combination with -I, the POST data will instead be appended to the
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URL with a HEAD request.
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If used multiple times, nothing special happens.
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.IP "-h/--help"
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Usage help.
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.IP "-H/--header <header>"
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(HTTP) Extra header to use when getting a web page. You may specify any number
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of extra headers. Note that if you should add a custom header that has the
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same name as one of the internal ones curl would use, your externally set
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header will be used instead of the internal one. This allows you to make even
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trickier stuff than curl would normally do. You should not replace internally
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set headers without knowing perfectly well what you're doing. Replacing an
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internal header with one without content on the right side of the colon will
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prevent that header from appearing.
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This option can be used multiple times to add/replace/remove multiple headers.
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.IP "-i/--include"
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(HTTP)
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Include the HTTP-header in the output. The HTTP-header includes things
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like server-name, date of the document, HTTP-version and more...
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If this option is used twice, the second will again disable header include.
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.IP "--interface <name>"
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Perform an operation using a specified interface. You can enter interface
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name, IP address or host name. An example could look like:
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.B "curl --interface eth0:1 http://www.netscape.com/"
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If this option is used several times, the last one will be used.
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.IP "-I/--head"
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(HTTP/FTP)
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Fetch the HTTP-header only! HTTP-servers feature the command HEAD
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which this uses to get nothing but the header of a document. When used
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on a FTP file, curl displays the file size only.
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If this option is used twice, the second will again disable header only.
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.IP "-j/--junk-session-cookies"
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(HTTP) When curl is told to read cookies from a given file, this option will
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make it discard all "session cookies". This will basicly have the same effect
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as if a new session is started. Typical browsers always discard session
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cookies when they're closed down. (Added in 7.9.7)
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If this option is used several times, each occurrence will toggle this on/off.
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.IP "-k/--insecure"
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(SSL) This option explicitly allows curl to perform "insecure" SSL connections
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and transfers. Starting with curl 7.10, all SSL connections will be attempted
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to be made secure by using the CA certificate bundle installed by
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default. This makes all connections considered "insecure" to fail unless
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-k/--insecure is used.
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This option is ignored if --cacert or --capath is used!
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If this option is used twice, the second time will again disable it.
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.IP "--krb4 <level>"
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(FTP) Enable kerberos4 authentication and use. The level must be entered and
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should be one of 'clear', 'safe', 'confidential' or 'private'. Should you use
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a level that is not one of these, 'private' will instead be used.
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If this option is used several times, the last one will be used.
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.IP "-K/--config <config file>"
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Specify which config file to read curl arguments from. The config file is a
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text file in which command line arguments can be written which then will be
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used as if they were written on the actual command line. Options and their
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parameters must be specified on the same config file line. If the parameter is
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to contain white spaces, the parameter must be inclosed within quotes. If the
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first column of a config line is a '#' character, the rest of the line will be
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treated as a comment.
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Specify the filename as '-' to make curl read the file from stdin.
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Note that to be able to specify a URL in the config file, you need to specify
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it using the --url option, and not by simply writing the URL on its own
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line. So, it could look similar to this:
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url = "http://curl.haxx.se/docs/"
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This option can be used multiple times.
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.IP "--limit-rate <speed>"
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Specify the maximum transfer rate you want curl to use. This feature is useful
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if you have a limited pipe and you'd like your transfer not use your entire
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bandwidth.
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The given speed is measured in bytes/second, unless a suffix is
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appended. Appending 'k' or 'K' will count the number as kilobytes, 'm' or M'
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makes it megabytes while 'g' or 'G' makes it gigabytes. Examples: 200K, 3m and
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1G.
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This option was introduced in curl 7.10.
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If this option is used several times, the last one will be used.
|
|
.IP "-l/--list-only"
|
|
(FTP)
|
|
When listing an FTP directory, this switch forces a name-only view.
|
|
Especially useful if you want to machine-parse the contents of an FTP
|
|
directory since the normal directory view doesn't use a standard look
|
|
or format.
|
|
|
|
This option causes an FTP NLST command to be sent. Some FTP servers
|
|
list only files in their response to NLST; they do not include
|
|
subdirectories and symbolic links.
|
|
|
|
If this option is used twice, the second will again disable list only.
|
|
.IP "-L/--location"
|
|
(HTTP/HTTPS) If the server reports that the requested page has a different
|
|
location (indicated with the header line Location:) this flag will let curl
|
|
attempt to reattempt the get on the new place. If used together with -i or -I,
|
|
headers from all requested pages will be shown. If authentication is used,
|
|
curl will only send its credentials to the initial host, so if a redirect
|
|
takes curl to a different host, it won't intercept the user+password. See also
|
|
\fI--location-trusted\fP on how to change this.
|
|
|
|
If this option is used twice, the second will again disable location following.
|
|
.IP "--location-trusted"
|
|
(HTTP/HTTPS) Like \fI--location\fP, but will allow sending the name + password
|
|
to all hosts that the site may redirect to. This may or may not introduce a
|
|
security breach if the site redirects you do a site to which you'll send your
|
|
authentication info (which is plaintext in the case of HTTP Basic
|
|
authentication).
|
|
|
|
If this option is used twice, the second will again disable location following.
|
|
.IP "-m/--max-time <seconds>"
|
|
Maximum time in seconds that you allow the whole operation to take. This is
|
|
useful for preventing your batch jobs from hanging for hours due to slow
|
|
networks or links going down. This doesn't work fully in win32 systems. See
|
|
also the \fI--connect-timeout\fP option.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-M/--manual"
|
|
Manual. Display the huge help text.
|
|
.IP "-n/--netrc"
|
|
Makes curl scan the
|
|
.I .netrc
|
|
file in the user's home directory for login name and password. This is
|
|
typically used for ftp on unix. If used with http, curl will enable user
|
|
authentication. See
|
|
.BR netrc(4)
|
|
or
|
|
.BR ftp(1)
|
|
for details on the file format. Curl will not complain if that file
|
|
hasn't the right permissions (it should not be world nor group
|
|
readable). The environment variable "HOME" is used to find the home
|
|
directory.
|
|
|
|
A quick and very simple example of how to setup a
|
|
.I .netrc
|
|
to allow curl to ftp to the machine host.domain.com with user name
|
|
\&'myself' and password 'secret' should look similar to:
|
|
|
|
.B "machine host.domain.com login myself password secret"
|
|
|
|
If this option is used twice, the second will again disable netrc usage.
|
|
.IP "--negotiate"
|
|
(HTTP) Enables GSS-Negotiate authentication. The GSS-Negotiate method was
|
|
designed by Microsoft and is used in their web aplications. It is primarily
|
|
meant as a support for Kerberos5 authentication but may be also used along
|
|
with another authentication methods. For more information see IETF draft
|
|
draft-brezak-spnego-http-04.txt. (Added in 7.10.6)
|
|
|
|
\fBNOTE\fP that this option requiures that the library was built with GSSAPI
|
|
support. This is not very common. Use \fIcurl --version\fP to see if your
|
|
version supports GSS-Negotiate.
|
|
|
|
If this option is used several times, the following occurrences make no
|
|
difference.
|
|
.IP "-N/--no-buffer"
|
|
Disables the buffering of the output stream. In normal work situations, curl
|
|
will use a standard buffered output stream that will have the effect that it
|
|
will output the data in chunks, not necessarily exactly when the data arrives.
|
|
Using this option will disable that buffering.
|
|
|
|
If this option is used twice, the second will again switch on buffering.
|
|
.IP "--ntlm"
|
|
(HTTP) Enables NTLM authentication. The NTLM authentication method was
|
|
designed by Microsoft and is used by IIS web servers. It is a proprietary
|
|
protocol, reversed engineered by clever people and implemented in curl based
|
|
on their efforts. This kind of behavior should not be endorsed, you should
|
|
encourage everyone who uses NTLM to switch to a public and documented
|
|
authentication method instead. Such as Digest. (Added in 7.10.6)
|
|
|
|
\fBNOTE\fP that this option requiures that the library was built with SSL
|
|
support. Use \fIcurl --version\fP to see if your version supports NTLM.
|
|
|
|
If this option is used several times, the following occurrences make no
|
|
difference.
|
|
.IP "-o/--output <file>"
|
|
Write output to <file> instead of stdout. If you are using {} or [] to fetch
|
|
multiple documents, you can use '#' followed by a number in the <file>
|
|
specifier. That variable will be replaced with the current string for the URL
|
|
being fetched. Like in:
|
|
|
|
curl http://{one,two}.site.com -o "file_#1.txt"
|
|
|
|
or use several variables like:
|
|
|
|
curl http://{site,host}.host[1-5].com -o "#1_#2"
|
|
|
|
You may use this option as many times as you have number of URLs.
|
|
|
|
See also the --create-dirs option to create the local directories dynamically.
|
|
.IP "-O/--remote-name"
|
|
Write output to a local file named like the remote file we get. (Only the file
|
|
part of the remote file is used, the path is cut off.)
|
|
|
|
You may use this option as many times as you have number of URLs.
|
|
.IP "-p/--proxytunnel"
|
|
When an HTTP proxy is used, this option will cause non-HTTP protocols to
|
|
attempt to tunnel through the proxy instead of merely using it to do HTTP-like
|
|
operations. The tunnel approach is made with the HTTP proxy CONNECT request
|
|
and requires that the proxy allows direct connect to the remote port number
|
|
curl wants to tunnel through to.
|
|
|
|
If this option is used twice, the second will again disable proxy tunnel.
|
|
.IP "-P/--ftpport <address>"
|
|
(FTP)
|
|
Reverses the initiator/listener roles when connecting with ftp. This
|
|
switch makes Curl use the PORT command instead of PASV. In
|
|
practice, PORT tells the server to connect to the client's specified
|
|
address and port, while PASV asks the server for an ip address and
|
|
port to connect to. <address> should be one of:
|
|
.RS
|
|
.TP 12
|
|
.B interface
|
|
i.e "eth0" to specify which interface's IP address you want to use (Unix only)
|
|
.TP
|
|
.B "IP address"
|
|
i.e "192.168.10.1" to specify exact IP number
|
|
.TP
|
|
.B "host name"
|
|
i.e "my.host.domain" to specify machine
|
|
.TP
|
|
.B "-"
|
|
(any single-letter string) to make it pick the machine's default
|
|
.RE
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-q"
|
|
If used as the first parameter on the command line, the
|
|
.I $HOME/.curlrc
|
|
file will not be read and used as a config file.
|
|
.IP "-Q/--quote <comand>"
|
|
(FTP) Send an arbitrary command to the remote FTP server, by using the QUOTE
|
|
command of the server. Not all servers support this command, and the set of
|
|
QUOTE commands are server specific! Quote commands are sent BEFORE the
|
|
transfer is taking place. To make commands take place after a successful
|
|
transfer, prefix them with a dash '-'. You may specify any amount of commands
|
|
to be run before and after the transfer. If the server returns failure for one
|
|
of the commands, the entire operation will be aborted.
|
|
|
|
This option can be used multiple times.
|
|
.IP "--random-file <file>"
|
|
(HTTPS) Specify the path name to file containing what will be considered as
|
|
random data. The data is used to seed the random engine for SSL connections.
|
|
See also the
|
|
.I "--edg-file"
|
|
option.
|
|
.IP "-r/--range <range>"
|
|
(HTTP/FTP)
|
|
Retrieve a byte range (i.e a partial document) from a HTTP/1.1 or FTP
|
|
server. Ranges can be specified in a number of ways.
|
|
.RS
|
|
.TP 10
|
|
.B 0-499
|
|
specifies the first 500 bytes
|
|
.TP
|
|
.B 500-999
|
|
specifies the second 500 bytes
|
|
.TP
|
|
.B -500
|
|
specifies the last 500 bytes
|
|
.TP
|
|
.B 9500
|
|
specifies the bytes from offset 9500 and forward
|
|
.TP
|
|
.B 0-0,-1
|
|
specifies the first and last byte only(*)(H)
|
|
.TP
|
|
.B 500-700,600-799
|
|
specifies 300 bytes from offset 500(H)
|
|
.TP
|
|
.B 100-199,500-599
|
|
specifies two separate 100 bytes ranges(*)(H)
|
|
.RE
|
|
|
|
(*) = NOTE that this will cause the server to reply with a multipart
|
|
response!
|
|
|
|
You should also be aware that many HTTP/1.1 servers do not have this feature
|
|
enabled, so that when you attempt to get a range, you'll instead get the whole
|
|
document.
|
|
|
|
FTP range downloads only support the simple syntax 'start-stop' (optionally
|
|
with one of the numbers omitted). It depends on the non-RFC command SIZE.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-R/--remote-time"
|
|
When used, this will make libcurl attempt to figure out the timestamp of the
|
|
remote file, and if that is available make the local file get that same
|
|
timestamp.
|
|
|
|
If this option is used twice, the second time disables this again.
|
|
.IP "-s/--silent"
|
|
Silent mode. Don't show progress meter or error messages. Makes
|
|
Curl mute.
|
|
|
|
If this option is used twice, the second will again disable mute.
|
|
.IP "-S/--show-error"
|
|
When used with -s it makes curl show error message if it fails.
|
|
|
|
If this option is used twice, the second will again disable show error.
|
|
.IP "--stderr <file>"
|
|
Redirect all writes to stderr to the specified file instead. If the file name
|
|
is a plain '-', it is instead written to stdout. This option has no point when
|
|
you're using a shell with decent redirecting capabilities.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-t/--telnet-option <OPT=val>"
|
|
Pass options to the telnet protocol. Supported options are:
|
|
|
|
TTYPE=<term> Sets the terminal type.
|
|
|
|
XDISPLOC=<X display> Sets the X display location.
|
|
|
|
NEW_ENV=<var,val> Sets an environment variable.
|
|
.IP "-T/--upload-file <file>"
|
|
This transfers the specified local file to the remote URL. If there is no file
|
|
part in the specified URL, Curl will append the local file name. NOTE that you
|
|
must use a trailing / on the last directory to really prove to Curl that there
|
|
is no file name or curl will think that your last directory name is the remote
|
|
file name to use. That will most likely cause the upload operation to fail. If
|
|
this is used on a http(s) server, the PUT command will be used.
|
|
|
|
Use the file name "-" (a single dash) to use stdin instead of a given file.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--trace <file>"
|
|
Enables a full trace dump of all incoming and outgoing data, including
|
|
descriptive information, to the given output file. Use "-" as filename to have
|
|
the output sent to stdout.
|
|
|
|
If this option is used several times, the last one will be used. (Added in
|
|
7.9.7)
|
|
.IP "--trace-ascii <file>"
|
|
Enables a full trace dump of all incoming and outgoing data, including
|
|
descriptive information, to the given output file. Use "-" as filename to have
|
|
the output sent to stdout.
|
|
|
|
This is very similar to --trace, but leaves out the hex part and only shows
|
|
the ASCII part of the dump. It makes smaller output that might be easier to
|
|
read for untrained humans.
|
|
|
|
If this option is used several times, the last one will be used. (Added in
|
|
7.9.7)
|
|
.IP "-u/--user <user:password>"
|
|
Specify user and password to use when fetching. Read the MANUAL for detailed
|
|
examples of how to use this. If no password is specified, curl will ask for it
|
|
interactively.
|
|
|
|
You can also use the --digest option to enable Digest authentication when
|
|
communicating with HTTP 1.1 servers.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-U/--proxy-user <user:password>"
|
|
Specify user and password to use for Proxy authentication. If no
|
|
password is specified, curl will ask for it interactively.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "--url <URL>"
|
|
Specify a URL to fetch. This option is mostly handy when you want to specify
|
|
URL(s) in a config file.
|
|
|
|
This option may be used any number of times. To control where this URL is written, use the
|
|
.I -o
|
|
or the
|
|
.I -O
|
|
options.
|
|
.IP "-v/--verbose"
|
|
Makes the fetching more verbose/talkative. Mostly usable for debugging. Lines
|
|
starting with '>' means data sent by curl, '<' means data received by curl
|
|
that is hidden in normal cases and lines starting with '*' means additional
|
|
info provided by curl.
|
|
|
|
Note that if you want to see HTTP headers in the output, \fI-i/--include\fP
|
|
might be option you're looking for.
|
|
|
|
If you think this option still doesn't give you enough details, consider using
|
|
\fI--trace\fP or \fI--trace-ascii\fP instead.
|
|
|
|
If this option is used twice, the second will again disable verbose.
|
|
.IP "-V/--version"
|
|
Displays information about curl and the libcurl version it uses.
|
|
|
|
The first line includes the full version of curl, libcurl and other 3rd party
|
|
libraries linked with the executable.
|
|
|
|
The second line (starts with "Protocols:") shows all protocols that libcurl
|
|
reports to support.
|
|
|
|
The third line (starts with "Features:") shows specific features libcurl
|
|
reports to offer.
|
|
|
|
.IP "-w/--write-out <format>"
|
|
Defines what to display after a completed and successful operation. The format
|
|
is a string that may contain plain text mixed with any number of variables. The
|
|
string can be specified as "string", to get read from a particular file you
|
|
specify it "@filename" and to tell curl to read the format from stdin you
|
|
write "@-".
|
|
|
|
The variables present in the output format will be substituted by the value or
|
|
text that curl thinks fit, as described below. All variables are specified
|
|
like %{variable_name} and to output a normal % you just write them like
|
|
%%. You can output a newline by using \\n, a carriage return with \\r and a tab
|
|
space with \\t.
|
|
|
|
.B NOTE:
|
|
The %-letter is a special letter in the win32-environment, where all
|
|
occurrences of % must be doubled when using this option.
|
|
|
|
Available variables are at this point:
|
|
.RS
|
|
.TP 15
|
|
.B url_effective
|
|
The URL that was fetched last. This is mostly meaningful if you've told curl
|
|
to follow location: headers.
|
|
.TP
|
|
.B http_code
|
|
The numerical code that was found in the last retrieved HTTP(S) page.
|
|
.TP
|
|
.B time_total
|
|
The total time, in seconds, that the full operation lasted. The time will be
|
|
displayed with millisecond resolution.
|
|
.TP
|
|
.B time_namelookup
|
|
The time, in seconds, it took from the start until the name resolving was
|
|
completed.
|
|
.TP
|
|
.B time_connect
|
|
The time, in seconds, it took from the start until the connect to the remote
|
|
host (or proxy) was completed.
|
|
.TP
|
|
.B time_pretransfer
|
|
The time, in seconds, it took from the start until the file transfer is just
|
|
about to begin. This includes all pre-transfer commands and negotiations that
|
|
are specific to the particular protocol(s) involved.
|
|
.TP
|
|
.B time_starttransfer
|
|
The time, in seconds, it took from the start until the first byte is just about
|
|
to be transfered. This includes time_pretransfer and also the time the
|
|
server needs to calculate the result.
|
|
.TP
|
|
.B size_download
|
|
The total amount of bytes that were downloaded.
|
|
.TP
|
|
.B size_upload
|
|
The total amount of bytes that were uploaded.
|
|
.TP
|
|
.B size_header
|
|
The total amount of bytes of the downloaded headers.
|
|
.TP
|
|
.B size_request
|
|
The total amount of bytes that were sent in the HTTP request.
|
|
.TP
|
|
.B speed_download
|
|
The average download speed that curl measured for the complete download.
|
|
.TP
|
|
.B speed_upload
|
|
The average upload speed that curl measured for the complete upload.
|
|
.TP
|
|
.B content_type
|
|
The Content-Type of the requested document, if there was any. (Added in 7.9.5)
|
|
.RE
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-x/--proxy <proxyhost[:port]>"
|
|
Use specified HTTP proxy. If the port number is not specified, it is assumed
|
|
at port 1080.
|
|
|
|
This option overrides existing environment variables that sets proxy to
|
|
use. If there's an environment variable setting a proxy, you can set proxy to
|
|
\&"" to override it.
|
|
|
|
\fBNote\fP that all operations that are performed over a HTTP proxy will
|
|
transparantly be converted to HTTP. It means that certain protocol specific
|
|
operations might not be available. This is not the case if you can tunnel
|
|
through the proxy, as done with the \fI-p/--proxytunnel\fP option.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-X/--request <command>"
|
|
(HTTP)
|
|
Specifies a custom request to use when communicating with the HTTP server.
|
|
The specified request will be used instead of the standard GET. Read the
|
|
HTTP 1.1 specification for details and explanations.
|
|
|
|
(FTP)
|
|
Specifies a custom FTP command to use instead of LIST when doing file lists
|
|
with ftp.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-y/--speed-time <time>"
|
|
If a download is slower than speed-limit bytes per second during a speed-time
|
|
period, the download gets aborted. If speed-time is used, the default
|
|
speed-limit will be 1 unless set with -y.
|
|
|
|
This option controls transfers and thus will not affect slow connects etc. If
|
|
this is a concern for you, try the \fI--connect-timeout\fP option.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-Y/--speed-limit <speed>"
|
|
If a download is slower than this given speed, in bytes per second, for
|
|
speed-time seconds it gets aborted. speed-time is set with -Y and is 30 if
|
|
not set.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-z/--time-cond <date expression>"
|
|
(HTTP)
|
|
Request to get a file that has been modified later than the given time and
|
|
date, or one that has been modified before that time. The date expression can
|
|
be all sorts of date strings or if it doesn't match any internal ones, it
|
|
tries to get the time from a given file name instead! See the
|
|
.BR "GNU date(1)"
|
|
or
|
|
.BR "curl_getdate(3)"
|
|
man pages for date expression details.
|
|
|
|
Start the date expression with a dash (-) to make it request for a document
|
|
that is older than the given date/time, default is a document that is newer
|
|
than the specified date/time.
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-Z/--max-redirs <num>"
|
|
Set maximum number of redirection-followings allowed. If -L/--location is
|
|
used, this option can be used to prevent curl from following redirections "in
|
|
absurdum".
|
|
|
|
If this option is used several times, the last one will be used.
|
|
.IP "-3/--sslv3"
|
|
(HTTPS)
|
|
Forces curl to use SSL version 3 when negotiating with a remote SSL server.
|
|
.IP "-2/--sslv2"
|
|
(HTTPS)
|
|
Forces curl to use SSL version 2 when negotiating with a remote SSL server.
|
|
.IP "-0/--http1.0"
|
|
(HTTP) Forces curl to issue its requests using HTTP 1.0 instead of using its
|
|
internally preferred: HTTP 1.1.
|
|
.IP "-#/--progress-bar"
|
|
Make curl display progress information as a progress bar instead of the
|
|
default statistics.
|
|
|
|
If this option is used twice, the second will again disable the progress bar.
|
|
.SH FILES
|
|
.I ~/.curlrc
|
|
.RS
|
|
Default config file.
|
|
|
|
.SH ENVIRONMENT
|
|
.IP "http_proxy [protocol://]<host>[:port]"
|
|
Sets proxy server to use for HTTP.
|
|
.IP "HTTPS_PROXY [protocol://]<host>[:port]"
|
|
Sets proxy server to use for HTTPS.
|
|
.IP "FTP_PROXY [protocol://]<host>[:port]"
|
|
Sets proxy server to use for FTP.
|
|
.IP "GOPHER_PROXY [protocol://]<host>[:port]"
|
|
Sets proxy server to use for GOPHER.
|
|
.IP "ALL_PROXY [protocol://]<host>[:port]"
|
|
Sets proxy server to use if no protocol-specific proxy is set.
|
|
.IP "NO_PROXY <comma-separated list of hosts>"
|
|
list of host names that shouldn't go through any proxy. If set to a asterisk
|
|
'*' only, it matches all hosts.
|
|
.SH EXIT CODES
|
|
There exists a bunch of different error codes and their corresponding error
|
|
messages that may appear during bad conditions. At the time of this writing,
|
|
the exit codes are:
|
|
.IP 1
|
|
Unsupported protocol. This build of curl has no support for this protocol.
|
|
.IP 2
|
|
Failed to initialize.
|
|
.IP 3
|
|
URL malformat. The syntax was not correct.
|
|
.IP 4
|
|
URL user malformatted. The user-part of the URL syntax was not correct.
|
|
.IP 5
|
|
Couldn't resolve proxy. The given proxy host could not be resolved.
|
|
.IP 6
|
|
Couldn't resolve host. The given remote host was not resolved.
|
|
.IP 7
|
|
Failed to connect to host.
|
|
.IP 8
|
|
FTP weird server reply. The server sent data curl couldn't parse.
|
|
.IP 9
|
|
FTP access denied. The server denied login.
|
|
.IP 10
|
|
FTP user/password incorrect. Either one or both were not accepted by the
|
|
server.
|
|
.IP 11
|
|
FTP weird PASS reply. Curl couldn't parse the reply sent to the PASS request.
|
|
.IP 12
|
|
FTP weird USER reply. Curl couldn't parse the reply sent to the USER request.
|
|
.IP 13
|
|
FTP weird PASV reply, Curl couldn't parse the reply sent to the PASV request.
|
|
.IP 14
|
|
FTP weird 227 format. Curl couldn't parse the 227-line the server sent.
|
|
.IP 15
|
|
FTP can't get host. Couldn't resolve the host IP we got in the 227-line.
|
|
.IP 16
|
|
FTP can't reconnect. Couldn't connect to the host we got in the 227-line.
|
|
.IP 17
|
|
FTP couldn't set binary. Couldn't change transfer method to binary.
|
|
.IP 18
|
|
Partial file. Only a part of the file was transfered.
|
|
.IP 19
|
|
FTP couldn't download/access the given file, the RETR (or similar) command
|
|
failed.
|
|
.IP 20
|
|
FTP write error. The transfer was reported bad by the server.
|
|
.IP 21
|
|
FTP quote error. A quote command returned error from the server.
|
|
.IP 22
|
|
HTTP page not retrieved. The requested url was not found or returned another
|
|
error with the HTTP error code being 400 or above. This return code only
|
|
appears if --fail is used.
|
|
.IP 23
|
|
Write error. Curl couldn't write data to a local filesystem or similar.
|
|
.IP 24
|
|
Malformat user. User name badly specified.
|
|
.IP 25
|
|
FTP couldn't STOR file. The server denied the STOR operation.
|
|
.IP 26
|
|
Read error. Various reading problems.
|
|
.IP 27
|
|
Out of memory. A memory allocation request failed.
|
|
.IP 28
|
|
Operation timeout. The specified time-out period was reached according to the
|
|
conditions.
|
|
.IP 29
|
|
FTP couldn't set ASCII. The server returned an unknown reply.
|
|
.IP 30
|
|
FTP PORT failed. The PORT command failed.
|
|
.IP 31
|
|
FTP couldn't use REST. The REST command failed.
|
|
.IP 32
|
|
FTP couldn't use SIZE. The SIZE command failed. The command is an extension
|
|
to the original FTP spec RFC 959.
|
|
.IP 33
|
|
HTTP range error. The range "command" didn't work.
|
|
.IP 34
|
|
HTTP post error. Internal post-request generation error.
|
|
.IP 35
|
|
SSL connect error. The SSL handshaking failed.
|
|
.IP 36
|
|
FTP bad download resume. Couldn't continue an earlier aborted download.
|
|
.IP 37
|
|
FILE couldn't read file. Failed to open the file. Permissions?
|
|
.IP 38
|
|
LDAP cannot bind. LDAP bind operation failed.
|
|
.IP 39
|
|
LDAP search failed.
|
|
.IP 40
|
|
Library not found. The LDAP library was not found.
|
|
.IP 41
|
|
Function not found. A required LDAP function was not found.
|
|
.IP 42
|
|
Aborted by callback. An application told curl to abort the operation.
|
|
.IP 43
|
|
Internal error. A function was called with a bad parameter.
|
|
.IP 44
|
|
Internal error. A function was called in a bad order.
|
|
.IP 45
|
|
Interface error. A specified outgoing interface could not be used.
|
|
.IP 46
|
|
Bad password entered. An error was signaled when the password was entered.
|
|
.IP 47
|
|
Too many redirects. When following redirects, curl hit the maximum amount.
|
|
.IP 48
|
|
Unknown TELNET option specified.
|
|
.IP 49
|
|
Malformed telnet option.
|
|
.IP 51
|
|
The remote peer's SSL certificate wasn't ok
|
|
.IP 52
|
|
The server didn't reply anything, which here is considered an error.
|
|
.IP 53
|
|
SSL crypto engine not found
|
|
.IP 54
|
|
Cannot set SSL crypto engine as default
|
|
.IP 55
|
|
Failed sending network data
|
|
.IP 56
|
|
Failure in receiving network data
|
|
.IP 57
|
|
Share is in use (internal error)
|
|
.IP 58
|
|
Problem with the local certificate
|
|
.IP 59
|
|
Couldn't use specified SSL cipher
|
|
.IP 60
|
|
Problem with the CA cert (path? permission?)
|
|
.IP 61
|
|
Unrecognized transfer encoding
|
|
.IP XX
|
|
There will appear more error codes here in future releases. The existing ones
|
|
are meant to never change.
|
|
.SH AUTHORS / CONTRIBUTORS
|
|
Daniel Stenberg is the main author, but the whole list of contributors is
|
|
found in the separate THANKS file.
|
|
.SH WWW
|
|
http://curl.haxx.se
|
|
.SH FTP
|
|
ftp://ftp.sunet.se/pub/www/utilities/curl/
|
|
.SH "SEE ALSO"
|
|
.BR ftp (1),
|
|
.BR wget (1),
|
|
.BR snarf (1)
|