cc:/sftp/test#
# cat test_sftp.cgi
#!/usr/bin/perl -w

use strict;
use warnings;
use Net::SFTP;

my $file       = 'TEST.txt';
my $server     = 'X.X.X.X';
my $user       = 'user';
my $sftp;
my %args       = ( ssh_args => { user            => 'user',
                                 identity_files  => [ '/root/.ssh/id_rsa' ],
                                 debug           => 1
                               }
);


$sftp = Net::SFTP->new($server, %args)
     or die "could not open connection to $server\n";

$sftp->put($file, $file) or die "could not upload $file\n";

exit;

##</code><code>##

cc:/sftp/test# perl test_sftp.cgi
cc: Reading configuration data /root/.ssh/config
cc: Reading configuration data /etc/ssh_config
cc: Allocated local port 1023.
cc: Connecting to X.X.X.X, port 22.
cc: Remote protocol version 2.0, remote software version 4.0.7.1 SSH Secure Shell Windows NT Server
cc: Net::SSH::Perl Version 1.34, protocol version 2.0.
.inux.ch.bluee.net: No compat match: 4.0.7.1 SSH Secure Shell Windows NT Server
cc: Connection established.
cc: Sent key-exchange init (KEXINIT), wait response.
cc: Algorithms, c->s: 3des-cbc hmac-sha1 none
cc: Algorithms, s->c: 3des-cbc hmac-sha1 none
cc: Entering Diffie-Hellman Group 1 key exchange.
cc: Sent DH public key, waiting for reply.
cc: Received host key, type 'ssh-dss'.
cc: Host 'X.X.X.X' is known and matches the host key.
cc: Computing shared secret key.
cc: Verifying server signature.
cc: Waiting for NEWKEYS message.
cc: Send NEWKEYS.
cc: Enabling encryption/MAC/compression.
cc: Sending request for user-authentication service.
cc: Service accepted: ssh-userauth.
cc: Trying empty user-authentication request.
cc: Authentication methods that can continue: gssapi,publickey,password.
cc: Next method to try is publickey.
cc: Trying pubkey authentication with key file '/root/.ssh/id_rsa'
cc: Login completed, opening dummy shell channel.
cc: channel 0: new [client-session]
cc: Requesting channel_open for channel 0.
cc: channel 0: open confirm rwindow 100000 rmax 16384
cc: channel 1: new [client-session]
cc: Requesting channel_open for channel 1.
cc: Sending subsystem: sftp
cc: Requesting service subsystem on channel 1.
cc: channel 1: open confirm rwindow 100000 rmax 16384

##</code><code>##

my $file       = '/sftp/test/TEST.txt';


##</code><code>##

...............................................................
...............................................................
...............................................................
cc: Sending subsystem: sftp
cc: Requesting service subsystem on channel 1.
cc: channel 1: open confirm rwindow 100000 rmax 16384
Couldn't get handle: Permission denied at test_sftp.cgi line 21
could not upload /sftp/test/TEST.txt