COMM - reference manual online

Compare two sorted files line by line.

February 2017
COMM(1)                                   User Commands                                   COMM(1)

NAME comm - compare two sorted files line by line
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 -z, --zero-terminated line delimiter is NUL, not newline --help display this help and exit --version output version information and exit Note, 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: <> Report comm translation bugs to <>
SEE ALSO join(1), uniq(1) Full documentation at: <> or available locally via: info '(coreutils) comm invocation'
GNU coreutils 8.25 February 2017 COMM(1)
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comm(1) referred by join(1) | uniq(1)
refer to join(1) | uniq(1)