using #! and a different shell

[Guy Harris]

>In non-hacked AT&T flavors of Unix, the setup is handled
>by the shell,

In non-hacked AT&T flavors of UNIX that don't have "Release 4" in their
name, "#!" isn't handled by the kernel nor by the shell.  In non-hacked
AT&T flavors of UNIX that *do* have "Release 4" in their name, "#!" is
handled by the kernel, in the same fashion that it's handled by BSD and
by many (probably most, if not all) other systems that have picked up "#!"
from BSD.