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From: jik@athena.mit.edu (Jonathan I. Kamens)
Newsgroups: comp.unix.questions
Subject: Re: Inserting Blank Line into File (sed/awk/?)
Message-ID: <1991Mar15.183105.19269@athena.mit.edu>
Date: 15 Mar 91 18:31:05 GMT
References: <807@oss670.UUCP>
Sender: news@athena.mit.edu (News system)
Organization: Massachusetts Institute of Technology
Lines: 13

In article <807@oss670.UUCP>, tkevans@oss670.UUCP (Tim Evans) writes:
|> I would like to be able to insert blank lines at regular intervals
|> in a structured file.  Specifically, I want to place a blank line after
|> every third line in my input file.  Every third line in the input file
|> begins with a specific character string.

awk '{print} NR % 3 == 0 {print ""}'

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