1.\" $NetBSD: comm.1,v 1.6 1999/02/11 00:53:24 hubertf 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. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the University of 20.\" California, Berkeley and its contributors. 21.\" 4. Neither the name of the University nor the names of its contributors 22.\" may be used to endorse or promote products derived from this software 23.\" without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35.\" SUCH DAMAGE. 36.\" 37.\" @(#)comm.1 8.1 (Berkeley) 6/6/93 38.\" 39.Dd June 6, 1993 40.Os 41.Dt COMM 1 42.Sh NAME 43.Nm comm 44.Nd select or reject lines common to two files 45.Sh SYNOPSIS 46.Nm 47.Op Fl 123f 48.Ar file1 file2 49.Sh DESCRIPTION 50The 51.Nm 52utility reads 53.Ar file1 54and 55.Ar file2 , 56which should be 57sorted lexically, and produces three text 58columns as output: lines only in 59.Ar file1 ; 60lines only in 61.Ar file2 ; 62and lines in both files. 63.Pp 64The filename ``-'' means the standard input. 65.Pp 66The following options are available: 67.Bl -tag -width Ds 68.It Fl 1 69Suppress printing of column 1. 70.It Fl 2 71Suppress printing of column 2. 72.It Fl 3 73Suppress printing of column 3. 74.It Fl f 75Fold case in line comparisons. 76.El 77.Pp 78Each column will have a number of tab characters prepended to it 79equal to the number of lower numbered columns that are being printed. 80For example, if column number two is being suppressed, lines printed 81in column number one will not have any tabs preceding them, and lines 82printed in column number three will have one. 83.Pp 84.Nm 85assumes that the files are lexically sorted; all characters 86participate in line comparisons. 87.\" .Sh ENVIRONMENT 88.\" .Bl -tag -width indent 89.\" .It Ev LANG 90.\" .It Ev LC_ALL 91.\" .It Ev LC_CTYPE 92.\" .It Ev LC_COLLATE 93.\" .It Ev LC_MESSAGES 94.\" .El 95.Sh DIAGNOSTICS 96.Nm 97exits 0 on success, >0 if an error occurred. 98.Sh SEE ALSO 99.Xr cmp 1 , 100.Xr diff 1 , 101.Xr sort 1 , 102.Xr uniq 1 103.Sh STANDARDS 104The 105.Nm 106utility conforms to 107.St -p1003.2-92 . 108