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how do I filter out permissions errors out of find / | grep foo output?

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Well, I think find / -iname '*foo*' would be a better command. But you can redirect stderr to /dev/null to get rid of all errors. Or redirect stderr to stdout and then filter with grep:

find / 2>/dev/null | grep foo
find \  |& grep 'No Such'
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find / -iname 'foo', definitely ;-) –  David Z May 22 '09 at 17:41
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