tldr/pages/common/comm.md

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# comm
> Select or reject lines common to two files. Both files must be sorted.
- Produce three tab-separated columns: lines only in first file, lines only in second file and common lines.
`comm {{file1}} {{file2}}`
- Print only lines common to both files.
`comm -12 {{file1}} {{file2}}`
- Print only lines common to both files, read one file from stdin.
`cat {{file1}} | comm -12 - {{file2}}`
- Print lines only found in first file.
`comm -23 {{file1}} {{file2}}`
- Print lines only found in second file.
`comm -13 {{file1}} {{file2}}`