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
The input files must be sorted before
comm can be used.
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 TAB.
The options `-1', `-2', and `-3' suppress printing of the corresponding columns. Also see section Common options.
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