How can I ssh inside a Perl script?

Question

I want to SSH to a server and execute a simple command like \"id\" and get the output of it and store it to a file on my primary server. I do not have privileges to install

Answer 1

or, assuming host keys are present and you want to do something with the command ouput ...

open(SSH,"/usr/bin/ssh you\@server ps aux |") or die "$!\n";
while (<SSH>) { 
   # do stuff with $_ 
}
close SSH;

Answer 2

Assuming that you're in an environment like me where you can't add additional modules and you can't create an Identity file, then you can use this script as a starting point.

If you can set up ssh keys then simply use the backticks command already posted, although you might need the -i option

#!/usr/bin/perl
use warnings;
use strict;
use Expect;
use Data::Dumper;

my $user = 'user';
my $pw = 'password';
my $host = 'host';
my $cmd = 'id';

my $exp = new Expect;
$exp->log_file("SSHLOGFILE.txt");
$exp->log_stdout(0);
$exp->raw_pty(1);


my $cli = "/usr/bin/ssh $user\@$host -o StrictHostKeyChecking=no -q $cmd";

$exp->spawn($cli) or die "Cannot spawn $cli: $!\n";

$exp->expect(5,
 [ qr /ssword:*/ => sub { my $exph = shift;
                          $exph->send("$pw\n");
                          exp_continue; }] );

my $read = $exp->exp_before();
chomp $read;
print Dumper($read);

$exp->soft_close();

Answer 3

If you have ssh host keys setup you can simply run the ssh system command and then specify the command to run on the machine after that. For example:

`ssh user@remoteserver.domain.com id`

You should be able to chomp/store that output.