DISCUSSION: Quick and Dirty Guide to Linux File Permissions
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You pointed out correctly, there is no use of setting SUID on scripts, but there is an exception, perl scripts . Check bellow link, I explained SUID bit using perl script.
A lot of effort has been made to prepare the article. I picked up some 'bits' to try later. Yet I am not experienced enough to digest the whole lot. Thanks for the writer.
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Some good hints for newbies
