Well, um, you're code looks horrible with a lot of bug and won't compile.

I wonder why you want to use perl for this task. You don't really use the output or something. I'd use a shell script. For sh:

#!/bin/sh
#
# some variations for executing 3 commands

$1 ;  $2 ;  $3   # commands get executed after one another
$1 && $2 && $3   # commands get only executed if previous succeeds
$1 &  $2 &  $3 & # commands get forked

# well you get the point, man sh for more ...
[download]

- Good luck