chmod u+s confusion

[Chris Largret <largret@gmail.com>]

Hey,

I've used chmod to set suid for a file before and thought I had a good
grasp of how it worked. Recently I've found myself trying to set it for
a script. Here's what I see ($ denotes user account, # is root):

$ echo -e '#!/bin/sh\n\nwhoami'>whoami.sh
# chown root:root whoami.sh
# chmod 4755 whoami.sh
$ ./whoami.sh
chris
# chmod u+s `which whoami`
$ whoami
root

[Note: u+s is equivalent to 4xxx, sorry for the change-up]

So... why doesn't this make whoami.sh run the 'whoami' program as root?
It's worked for the programs whoami, and is a common mode set on
cdrecord.

Thanks for your help (and enlightenment).

--
Chris Largret <http://daga.dyndns.org>

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