Shell Programming and Scripting

Since I'm just new in unix, can I ask the experts on how I can develop or enhance a unix utility in protecting or securing a file using scripts.

Im thinking chmod, is it enought? or are there other utilities in unix?

My algorithm is like there will be a menu that shows a list of types of protection that the user wants to put in his/her file. and also to unprotect files. *I need more ideas.

sample

1 Protect
2 Unprotect
3 etc that you can add
4 etc that you can add
5. maybe exit here.

then input will be

"filename" "choice"

Thanks in advance

ith the right owner or group on the file that should do the trick.

why do u think chmod is not enough? Can you provide and example?

Most UNIX/Linux have file ACL's these days. If you can tell us what O/S you are using we can advise you on their implementation of file Access Control Lists.

Thx.