using grep with pipe and ampersand to filter errors from find

Posted by HKK on Ask Ubuntu See other posts from Ask Ubuntu or by HKK
Published on 2011-02-05T19:25:17Z Indexed on 2011/02/07 7:33 UTC
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Filed under:

command-line

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bash

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shell

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find

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grep

I am using cygwin to find a file on the cygdrive.

However I need to suppress the permission denied messages (otherwise the results get hidden in the error messages). The following command works:

find -name 'myfile.*' |& grep -v "Permission denied"

I don't understand why the ampersand needs to be put into this command, would have expected this to work but it doesn't.

find -name 'myfile.*' | grep -v "Permission denied"

Please explain the meaning of the ampersand.

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