Inserting Blank Line into File (sed/awk/?)

[Jonathan I. Kamens]

In article <807 at oss670.UUCP>, tkevans at 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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