#!/usr/bin/perl
use Shell qw(echo);

echo "foo bar ;";   # with ";" --> uses 'echo' shell built-in

echo "foo bar";     # uses /bin/echo

##</code><code>##

(echo "foo bar ;")
...
[pid 23888] execve("/bin/sh", ["sh", "-c", "echo foo bar ;"], ...

(echo "foo bar")
...
[pid 23889] execve("/bin/echo", ["echo", "foo", "bar"], ...