Unknown option: "-3" Unix manual page for CURLOPT_SSH_PRIVATE_KEYFILE. (host=minya system=Darwin)
CURLOPT_SSH_PRIVATE_KEYFILEcurl_easy_setopt optiCURLOPT_SSH_PRIVATE_KEYFILE(3)

NAME
       CURLOPT_SSH_PRIVATE_KEYFILE - set private key file for SSH auth

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_PRIVATE_KEYFILE,
                                 char *filename);

DESCRIPTION
       Pass a char * pointing to a filename for your private key. If not used,
       libcurl defaults to $HOME/.ssh/id_dsa if the HOME environment  variable
       is  set, and just "id_dsa" in the current directory if HOME is not set.

       If the file is password-protected, set the password  with  CURLOPT_KEY-
       PASSWD(3).

       The  application  does not have to keep the string around after setting
       this option.

DEFAULT
       As explained above

PROTOCOLS
       SFTP and SCP

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.16.1

RETURN VALUE
       Returns CURLE_OK if the option is  supported,  CURLE_UNKNOWN_OPTION  if
       not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO
       CURLOPT_SSH_PUBLIC_KEYFILE(3), CURLOPT_SSH_AUTH_TYPES(3),

libcurl 7.54.0                 December 21, 2016CURLOPT_SSH_PRIVATE_KEYFILE(3)