Name
comm - compare two sorted files line by lineSynopsis
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
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: <https://www.gnu.org/software/coreutils/> Report any translation bugs to <https://translationproject.org/team/>Copyright
Copyright © 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.See Also
join(1), uniq(1)Full documentation <https://www.gnu.org/software/coreutils/comm> or available locally via: info \(aq(coreutils) comm invocation\(aq