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Manual

COMM(1)

User Commands

COMM(1)

NAME

comm - compare two sorted files line by line

SYNOPSIS

comm [OPTION]... FILE1 FILE2

DESCRIPTION

Compare sorted files FILE1 and FILE2 line by line.

When FILE1 or FILE2 (not both) is -, read standard input.

With no options, produce three-column output. Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and column three contains lines common to both files.

-1: suppress column 1 (lines unique to FILE1)
-2: suppress column 2 (lines unique to FILE2)
-3: suppress column 3 (lines that appear in both files)
--check-order: check that the input is correctly sorted, even if all input lines are pairable
--nocheck-order: do not check that the input is correctly sorted
--output-delimiter=STR: separate columns with STR
--total: output a summary
-z, --zero-terminated: line delimiter is NUL, not newline
--help: display this help and exit
--version: output version information and exit

Comparisons honor the rules specified by 'LC_COLLATE'.

EXAMPLES

comm -12 file1 file2: Print only lines present in both file1 and file2.
comm -3 file1 file2: Print lines in file1 not in file2, and vice versa.

AUTHOR

Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>