Zombie demonstration

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In one window launch htop and filter to 'perl'. In another window run this script.

examples/linux/create_zombie.pl

#!/usr/bin/perl
use strict;
use warnings;

print "parent $$\n";
my $pid = fork();
die "Could not fork $!\n" if not defined $pid;

if (not $pid) {
    print "in child: $$\n";
    exit;
}

print "In parent $$ child: $pid\n";
sleep 1;
system "ps -lef | grep perl";
sleep 1000;