Please use NULL instead of 0 whenever you have a pointer!

[ron%brl-vgr at sri-unix.UUCP]

From:      Ron Natalie <ron at brl-vgr>

This is wrong if you want to be strict about things:

	execl("/bin/echo", "echo", "hi", "there", 0);

And so is this!

	execl("/bin/echo", "echo", "hi", "there", NULL);

in system V (and most everything else) as NULL really is 0.

You are only guaranteed of being allowed to mix 0 and pointers
in assignment (that's with an equals, not passing to functions)
and comparison.  The correct way is:

	execl("/bin/echo", "echo", "hi", "there", (char *)0);

Because execl's arguments must be character pointers not ints!

-Ron