It probably will get more complicated than you want. You want to intercept the q keypress.

Here is a simple example, (or you can move up to an eventloop system, or watch STDIN in the separate thread, and let it watch for q). I 'm not sure how to pass the q to killing your command , unless you use a piped open or some other IPC module that returns a pid. Maybe someone knows a clever trick for that using return values from system.

#!/usr/bin/perl
use warnings;
use strict;
use Term::ReadKey;

#passing ReadKey() an argument of -1 to indicate not to block:
ReadMode('cbreak');

while(1){
my $char;
if (defined ($char = ReadKey(0)) ) {
        print "$char->", ord($char),"\n";    # input was waiting and i
+t was $char
        if(ord($char) == 113){ print "Got a q\n"; print "Do your thing
+ here\n"  }
        if(ord($char) == 27){ print "Got an Escape\n"; exit;  }
           
} else {
          # no input was waiting
        }
}

ReadMode('normal');                  # restore normal tty settings
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