Ian Ford asked about support for the FTP command ACCT, and I discovered it is

present in RFC959... so now (lib)curl supports it as well. --ftp-account and
CURLOPT_FTP_ACCOUNT set the account string. (The server may ask for an account
string after PASS have been sent away. The client responds with "ACCT [account
string]".) Added test case 228 and 229 to verify the functionality. Updated
the test FTP server to support ACCT somewhat.

lib/url.c

@@ -1396,6 +1396,10 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option, ...)
     data->set.source_postquote = va_arg(param, struct curl_slist *);
     break;
 
+  case CURLOPT_FTP_ACCOUNT:
+    data->set.ftp_account = va_arg(param, char *);
+    break;
+
   default:
     /* unknown tag and its companion, just ignore: */
     result = CURLE_FAILED_INIT; /* correct this */