I'm not sure if I fully understand your statement of the task, but in case it helps, here's a technique I've used to good effect when I want a perl script to run a series of commands in sequential order, and the script has to wait until all the commands are done before moving on: 
#!/usr/bin/perl

use strict;
use warnings;

my @cmd_list = ( 'echo 1', 'echo 2', 'echo 3', 'echo 4' );

$|++;  # turn off buffering

my $shpid = open( my $sh, '|-', '/bin/bash' )
    or die "Can't open a shell process: $!\n";

for my $cmd ( @cmd_list ) {
    print $sh "$cmd\n";
}
print $sh "exit\n";
close $sh;
waitpid( $shpid, 0 );

print "Shell's all done.  Moving right along...\n";

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In reply to Re: Multiple commands with one system call by graff
in thread Multiple commands with one system call by renzosilv

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