perl -e '
  open X, "</etc/passwd";
  fork();
  while (readline(X)){
    print "$$: $_";
    sleep 1
  }
  print "$$: all done\n"
'

##</code><code>##

8488: root:x:0:0:root:/root:/bin/bash
8489: all done
8488: daemon:x:1:1:daemon:/usr/sbin:/bin/sh
8488: bin:x:2:2:bin:/bin:/bin/sh
8488: <rest of the file>
8488: all done

##</code><code>##

$ perl -v

This is perl 5, version 14, subversion 2 (v5.14.2) built for x86_64-linux-gnu-thread-multi
(with 89 registered patches, see perl -V for more detail)