1.\" $NetBSD: comm.1,v 1.12 2014/04/13 01:45:34 snj Exp $ 2.\" 3.\" Copyright (c) 1989, 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the Institute of Electrical and Electronics Engineers, Inc. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" @(#)comm.1 8.1 (Berkeley) 6/6/93 34.\" 35.Dd June 6, 1993 36.Dt COMM 1 37.Os 38.Sh NAME 39.Nm comm 40.Nd select or reject lines common to two files 41.Sh SYNOPSIS 42.Nm 43.Op Fl 123f 44.Ar file1 file2 45.Sh DESCRIPTION 46The 47.Nm 48utility reads 49.Ar file1 50and 51.Ar file2 , 52which should be 53sorted lexically, and produces three text 54columns as output: lines only in 55.Ar file1 ; 56lines only in 57.Ar file2 ; 58and lines in both files. 59.Pp 60The filename ``-'' means the standard input. 61.Pp 62The following options are available: 63.Bl -tag -width Ds 64.It Fl 1 65Suppress printing of column 1. 66.It Fl 2 67Suppress printing of column 2. 68.It Fl 3 69Suppress printing of column 3. 70.It Fl f 71Fold case in line comparisons. 72.El 73.Pp 74Each column will have a number of tab characters prepended to it 75equal to the number of lower numbered columns that are being printed. 76For example, if column number two is being suppressed, lines printed 77in column number one will not have any tabs preceding them, and lines 78printed in column number three will have one. 79.Pp 80.Nm 81assumes that the files are lexically sorted; all characters 82participate in line comparisons. 83.\" .Sh ENVIRONMENT 84.\" .Bl -tag -width indent 85.\" .It Ev LANG 86.\" .It Ev LC_ALL 87.\" .It Ev LC_CTYPE 88.\" .It Ev LC_COLLATE 89.\" .It Ev LC_MESSAGES 90.\" .El 91.Sh EXIT STATUS 92.Ex -std 93.Sh SEE ALSO 94.Xr cmp 1 , 95.Xr diff 1 , 96.Xr sort 1 , 97.Xr uniq 1 98.Sh STANDARDS 99The 100.Nm 101utility conforms to 102.St -p1003.2-92 . 103