Question

#!/usr/bin/perl
$sim = "multiq";
`make SCHED=$sim`;
`script > scripter`;
`echo hi`;
print pack("c", 04);
~

This script hangs when script is called. Not sure how to get the perl script to keep running.

Answer 1

Note that backticks (‘‘) run a command and return its output. If you’re going to ignore the output, use system as in

system("make SCHED=$sim") == 0 or die "$0: make exited " . ($? >> 8)

If you want to fire-and-forget a program (that is, start it in the background without worrying about when it completes), you can use

system("script >scripter &");