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radoulov, isn't "fgrep ERROR file|fgrep -v foo "-the same as doing "grep ERROR file | grep -v foo", except it uses fgrep instead of grep? Is there some advantage for fgrep in this case?

The awk...

I wanted to search a for all lines containing ERROR but not errors that contained the word "foo" (for example). The only way I could figure out to do it was:

grep ERROR myfile.log | grep -v foo
...