Grep
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If you want to grep for two strings? say fish OR fowl in your file:
$ egrep '(fish|fowl)' file
To show all lines that do not start with a # (commented out):
# grep -v ^# /etc/inetd.conf
If you want to search for the some string resursively through subdirectories:
$ grep . -name "*" | xargs grep "some string"
(someone please optimize the above)
