How can I give double space between every three lines in a text file

Question

Editorial Team

Asked: June 6, 20262026-06-06T04:37:16+00:00 2026-06-06T04:37:16+00:00

How can I give double space between every three lines in a text file using awk?

Sample input:

line1
line2
line3     
line4
line5
line6
line7
----
----

line1
line2
line3

line4
line5
line6

line7
----
----

Any suggestions would be appreciated

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Editorial Team · Answer 1 · 2026-06-06T04:37:17+00:00

Editorial Team

Try this:

awk 'NR % 3 == 0 { print $0 ; print "" } NR % 3' INPUTFILE

And there are other ways…