In comp.unix.shell dave@geol.invalid:
Fri, 19 Aug 2005 00:29 +1000, thus spake Netocrat <netocrat@dodo.com.au>:
>>
>Thu, 18 Aug 2005 07:49:06 -0700, matt_left_coast wrote:
>>
Lucas wrote:
>>[]
I would like to make some exercises for a small AIX training. To do
this I want to make a few scripts that do something evil to the S
(corrupting the bootblock or filling the tmp filesystem to the last
bit something like that) Then the students should fix it.

The problem is that if they view the script that does this, they see
the answer right away. (instead of having to troubleshoot the whole
thing).

Anybody suggestions on how to hide what the script is doing?
>>[]
>>
? Damn, you are instructing people and you don't know how to set the
permissions of a script file to be readable only by the owner and root??
I feel sorry for the people you are training.
>>
>A shell script must be readable by the user executing it since the shell
>must be able to read it.

I thought about not responding since this seemed like possibly
feeding some nefarious endeavor but, thinking again,

?
Some people tried to help you, seems as if I start to feel sorry
for the people you are "training".

such hiding of a script is easy to overcome by root.
The way you do this is:

chgrp bin myscript
chmod 2551 myscript

The file is now executable by world but not world-readable.

Nope it isn't. Just as everyone else already pointed out it's not
possible for an user to execute a script he has no read
permissions. Execute permission don't really matter as long as
the user can read it.

[]