MirOS Manual: comm(1)

COMM(1)                      BSD Reference Manual                      COMM(1)

NAME

     comm - select or reject lines common to two files

SYNOPSIS

     comm [-123f] file1 file2

DESCRIPTION

     The comm utility reads file1 and file2, which should be sorted lexically,
     and produces three text columns as output: lines only in file1; lines
     only in file2; and lines in both files.

     The filename "-" means the standard input.

     The options are as follows:

     -1      Suppress printing of column 1.

     -2      Suppress printing of column 2.

     -3      Suppress printing of column 3.

     -f      Fold case in line comparisons.

     Each column will have a number of tab characters prepended to it equal to
     the number of lower numbered columns that are being printed. For example,
     if column number two is being suppressed, lines printed in column number
     one will not have any tabs preceding them, and lines printed in column
     number three will have one.

     comm assumes that the files are lexically sorted; all characters partici-
     pate in line comparisons.

     The comm utility exits 0 on success or >0 if an error occurred.

SEE ALSO

     cmp(1), diff(1), sort(1), uniq(1)

STANDARDS

     The comm utility conforms to IEEE Std 1003.2-1992 ("POSIX.2").

HISTORY

     A comm command appeared in Version 4 AT&T UNIX.

MirOS BSD #10-current            June 6, 1993                                1

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