How to use shell commands to work for my requests?

[Mc Shch]

   Hi all,

   I wanna know how to use shell commands to search some files which
   contain a specail strings i want...
   For example:
   i want to search some files which contain "getopt" string...

   any ideas?

   -Exploit_it
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References

   1. http://g.msn.com/8HMBCNCN/2749??PS=47575