Re: Need help with 3 line search and delete

"[email protected] [sed-users]" <[email protected]> 29 Jan 2015 15:29:56 -0800

Newsgroups	gmane.editors.sed.user
Message-ID	<[email protected]>

If the DROP lines are always followed by two lines to be dropped (a possibility considering that it's a log file), here is a simple way that I think works:
 

 $ cat logfile.log
line #1 to keep
line #2 to keep
DROP
line to drop
ERROR
line #3 to keep

 

 $ sed "/^DROP/ {N; N; d}" logfile.log
line #1 to keep
line #2 to keep
line #3 to keep

 

 Daniel



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