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comm
: Compare two sorted files line by line
comm
writes to standard output lines that are common, and lines
that are unique, to two input files; a file name of `-' means
standard input. Synopsis:
comm [option]... file1 file2 |
Before comm
can be used, the input files must be sorted using the
collating sequence specified by the LC_COLLATE
locale.
If an input file ends in a non-newline
character, a newline is silently appended. The sort
command with
no options always outputs a file that is suitable input to comm
.
With no options, comm
produces 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.
Columns are separated by a single TAB character.
The options `-1', `-2', and `-3' suppress printing of the corresponding columns. Also see 2. Common options.
Unlike some other comparison utilities, comm
has an exit
status that does not depend on the result of the comparison.
Upon normal completion comm
produces an exit code of zero.
If there is an error it exits with nonzero status.