#!perl -w
use strict;
use Net::SSH2;

my $remote_cmd = q{perl -MPOSIX=setsid -wle 'close STDIN;open STDOUT,">","/dev/null";$SIG{HUP}="ignore";fork and exit;setsid;sleep 3; open my $fh, ">", "/tmp/test.txt" or die $!'};
my $ssh = Net::SSH2->new();
$ssh->connect('mychat.dyn.datenzoo.de');
$ssh->auth(username => 'corion', password => 'rGj3HVR4');

sub run($) {
    my $ch = $ssh->channel;
    $ch->ext_data('merge');
    my $cmd = shift;
    print "remote>$cmd\n";
    $ch->exec($cmd)
        or die $ssh->error;
    my ($out,$err) = ('','');
    $ch->send_eof;
    while(!$ch->eof) {
        if (my ($o, $e) = $ch->read2) {
            $out .= $o;
            $err .= $e;
        }
        #else {
        #    $ssh->die_with_error;
        #}
    };
    print $out;
    print $err;
};

run 'rm /tmp/test.txt';
run 'ls -altr /tmp/test.txt';
run $remote_cmd;
sleep 1;

run 'ls -altr /tmp/test.txt';

sleep 1;

run 'ls -altr /tmp/test.txt';

sleep 1;
run 'ls -altr /tmp/test.txt';


##</code><code>##

C:\Users\Corion\Projekte>perl -w tmp.pl
remote>rm /tmp/test.txt
remote>ls -altr /tmp/test.txt
ls: File not found: /tmp/test.txt
remote>perl -MPOSIX=setsid -wle 'close STDIN;open STDOUT,">","/dev/null";$SIG{HUP}="ignore";fork and exit;setsid;sleep 3; open my $fh, ">", "/tmp/test.txt" or die $!'
Filehandle STDIN reopened as STDOUT only for output at -e line 1.
remote>ls -altr /tmp/test.txt
ls: File not found: /tmp/test.txt
remote>ls -altr /tmp/test.txt
ls: File not found: /tmp/test.txt
remote>ls -altr /tmp/test.txt
-rw-r--r-- 1 corion corion 0 Jun 16 18:49 /tmp/test.txt