my $cmd = "ssh -qv $ssh_user\@$bkp_destination 'sed -i \"s#.*$hostname#$skey#g\" /tmp/test.txt'";
warn "Launching [[$cmd]]";
system($cmd) == 0
    or die "Couldn't launch ssh connection via [[$cmd]]: $? / $!";

##</code><code>##

my $cmd = qq(ssh -qv $ssh_user\@$bkp_destination 'sed -i "s#.*$hostname#$skey#g" /tmp/test.txt');