4.3BSD-Reno/share/man/cat1/comm.0

COMM(1)                     UNIX Reference Manual		       COMM(1)

NNAAMMEE
     ccoommmm - Select or reject lines common to two files

SSYYNNOOPPSSIISS
     ccoommmm [--112233] _f_i_l_e_1 _f_i_l_e_2

DDEESSCCRRIIPPTTIIOONN
     The ccoommmm utility reads _f_i_l_e_1 and _f_i_l_e_2, which should be sorted lexically,
     and produces three text columns as output: lines only in _f_i_l_e_1; lines
     only in _f_i_l_e_2; and lines in both files.

     The filename `--' means the standard input.

     The following options are available:

     --11    Suppress printing of column 1.

     --22    Suppress printing of column 2.

     --33    Suppress printing of column 3.

     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 exam-
     ple, 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.

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

     CCoommmm exits 0 on success, >0 if an error occurred.

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

SSTTAANNDDAARRDDSS
     The ccoommmm function is expected to be POSIX 1003.2 compatible.