nepsilon/comm-cli-tip.md

Last active February 19, 2017 13:31

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CLI: Output the difference between 2 files — First published on fullweb.io issue #43

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CLI: Output the difference between 2 files

Thinking of using diff? Try comm, its sole purpose is to compare 2 sorted files line by line.

Show lines in A.txt but NOT in B.txt:

comm -2 -3 A.txt B.txt

If the files aren’t sorted, use:

comm -2 -3 <(sort A.txt) <(sort B.txt)

Show lines in B.txt but NOT in A.txt:

comm -2 -3 B.txt A.txt

BONUS: Show lines in both files (UNION):

comm -1 A.txt B.txt