I wasn't too sure where to post this question so I'm starting here. 
I have a need to do a search against several thousand files that DON'T 
contain any one of five to ten different strings of text. I know how 
to do a find command for any file that contain a certain string but 
don't know how to search for files that DON'T contain one of several 
things. How can I do this with the Unix OS?

The strings are something like:
1) aaa authentication + I don't remember the rest.
2) aaa authentication + I don't remember the rest + more text.
3) set authentication + I don't remember the rest.
4) set authentication + I don't remember the rest + more.
5) there may even be a couple of more strings of text.

P.S. I'm not very good with the Unix shell.

Thanks for any input on how I can do this.

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