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COMM
Section: User Commands (1)Updated: September 2017
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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: <http://www.gnu.org/software/coreutils/>Report comm translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright © 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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 at: <http://www.gnu.org/software/coreutils/comm>
or available locally via: info aq(coreutils) comm invocationaq