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4 .\" This code is derived from software contributed to Berkeley by
5 .\" the Institute of Electrical and Electronics Engineers, Inc.
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35 .\" From: @(#)comm.1 8.1 (Berkeley) 6/6/93
36 .\" $FreeBSD: src/usr.bin/comm/comm.1,v 1.4.2.5 2002/07/11 00:43:37 tjr Exp $
37 .\" $DragonFly: src/usr.bin/comm/comm.1,v 1.2 2003/06/17 04:29:25 dillon Exp $
44 .Nd select or reject lines common to two files
57 sorted lexically, and produces three text
58 columns as output: lines only in
62 and lines in both files.
64 The filename ``-'' means the standard input.
66 The following options are available:
67 .Bl -tag -width indent
69 Suppress printing of column 1.
71 Suppress printing of column 2.
73 Suppress printing of column 3.
75 Case insensitive comparison of lines.
78 Each column will have a number of tab characters prepended to it
79 equal to the number of lower numbered columns that are being printed.
80 For example, if column number two is being suppressed, lines printed
81 in column number one will not have any tabs preceding them, and lines
82 printed in column number three will have one.
86 utility assumes that the files are lexically sorted; all characters
87 participate in line comparisons.