if($cmd[0] eq "tail") {
    open(TAIL,"|tail -f /var/log/messages");
    my $tailing = 1;
    sub __int_tail {
      $tailing = 0;
    }
    $SIG{'INT'} = \&__int_tail;
    while($tailing) {
      while(<TAIL>) {
        print $_;
      } 
    }
    return 0;
  }