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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
comm can be used, the input files must be sorted using the
collating sequence specified by the
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
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.
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