1.\" Copyright (c) 1989, 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Institute of Electrical and Electronics Engineers, Inc. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)comm.1 8.1 (Berkeley) 6/6/93 36.\" 37.Dd June 6, 1993 38.Os 39.Dt COMM 1 40.Sh NAME 41.Nm comm 42.Nd select or reject lines common to two files 43.Sh SYNOPSIS 44.Nm comm 45.Op Fl 123 46.Ar file1 file2 47.Sh DESCRIPTION 48The 49.Nm comm 50utility reads 51.Ar file1 52and 53.Ar file2 , 54which should be 55sorted lexically, and produces three text 56columns as output: lines only in 57.Ar file1 ; 58lines only in 59.Ar file2 ; 60and lines in both files. 61.Pp 62The filename ``-'' means the standard input. 63.Pp 64The following options are available: 65.Bl -tag -width Ds 66.It Fl 1 67Suppress printing of column 1. 68.It Fl 2 69Suppress printing of column 2. 70.It Fl 3 71Suppress printing of column 3. 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 Comm 81assumes that the files are lexically sorted; all characters 82participate in line comparisons. 83.Sh DIAGNOSTICS 84.Nm Comm 85exits 0 on success, >0 if an error occurred. 86.Sh SEE ALSO 87.Xr cmp 1 , 88.Xr diff 1 , 89.Xr sort 1 , 90.Xr uniq 1 91.Sh STANDARDS 92The 93.Nm comm 94utility conforms to 95.St -p1003.2-92 . 96