$ssh->system("nohup ./script.pl &");

##</code><code>##

# Read File on remote machine
( $DATA, $ERR ) = $SSH->capture2( "cat <file on remote machine" );

# Write/Append $DATA to loca file
<write data to loca file>

##</code><code>##

$ssh->system({stdout_file => ['>>', $local_file]},
             cat => $remote_file).

##</code><code>##

my $PROC = $SSH->capture( "ps aux | grep <process_name> | grep -v grep | wc -l | sed 's/  *//'" );
if( $PROC == 0 ) {...