See A little demo for Net::SSH2.

As far as blocking and channels go, it's not simple, read perldoc Net::SSH2::Channel

If you want to exec something on the server, use this:

#!/usr/bin/perl
use warnings;
use strict;
use Net::SSH2;

my $pass = 'hahahaha';
my $ssh2 = Net::SSH2->new();

$ssh2->connect('localhost') or die "Unable to connect Host $@ \n";

#plain password login
#$ssh2->auth_password('z','ztester') or die "Unable to login $@ \n";

# works when run from z's homedir because you need
# permission to read the keys
$ssh2->auth_publickey('zentara',
                 '/home/zentara/.ssh/id_dsa.pub',
         '/home/zentara/.ssh/id_dsa',
          $pass );


my $chan = $ssh2->channel();
$chan->blocking(1);

$chan->exec("nohup /home/zentara/perlplay/net/zzsleep > foo.out 2> foo
+.err < /dev/null &");

$chan->send_eof;

exit;
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