from http://curl.haxx.se/libcurl/c/libcurl-errors.html
21 is "quote" error... a bit weirdly named, but apparently when rm was
broken around 2007 (per mailing list), same error popped up.

the command line example at the time was curl
sftp://.../path/to/file.txt --quote rm
Perhaps someone can correct me if that changed.

someone appears to have solved related issue by doing
url sftp://server/ and quoted command rm "/path/to/file.txt"
http://curl.haxx.se/mail/lib-2012-05/0101.html

good luck!

On 11 December 2013 06:19, 刘英伟 <506017026_at_qq.com> wrote:
> I want to delete file from sftp
> this is my code :
> curl_global_init(CURL_GLOBAL_DEFAULT);
> curl = curl_easy_init();
> curl_easy_setopt(curl, CURLOPT_URL,
> "sftp://admin:admin@132.40.130.35:22/ogsapp/tmp/hebh/sftptest/");
> headerlist = curl_slist_append(headerlist, "rm abc.c");
> result = curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist);
> printf("%d\n",result);
> result = curl_easy_perform(curl);
> printf("%d\n",result);
>
>
>
> but the abc.c is still exist and the curl_code is 21 .
>
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Received on 2013-12-11