GNU bug report logs - #35043
Is there a way to show file name once just before all the matches in the file?

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From: "Paul Jackson" <pj <at> usa.net>
To: 35043 <at> debbugs.gnu.org
Subject: bug#35043: Is there a way to show file name once just before all the	matches in the file?
Date: Fri, 29 Mar 2019 23:01:48 -0400

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The following awk command will do this (so long as filenames don't have ':' colon chars):

grep IP /etc/protocols /etc/services |
 awk -F: '
 $1 != fname { print $1 ":"; fname = $1; }
 { sub("^[^:]*:", ""); print; }
 '

-- 
 Paul Jackson
 pj <at> usa.net

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