1.\" $OpenBSD: cmp.1,v 1.14 2009/02/08 17:15:09 jmc Exp $ 2.\" $NetBSD: cmp.1,v 1.4 1995/09/08 03:22:55 tls Exp $ 3.\" 4.\" Copyright (c) 1987, 1990, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" This code is derived from software contributed to Berkeley by 8.\" the Institute of Electrical and Electronics Engineers, Inc. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)cmp.1 8.1 (Berkeley) 6/6/93 35.\" 36.Dd $Mdocdate: February 8 2009 $ 37.Dt CMP 1 38.Os 39.Sh NAME 40.Nm cmp 41.Nd compare two files 42.Sh SYNOPSIS 43.Nm cmp 44.Op Fl l | Fl s 45.Ar file1 file2 46.Op Ar skip1 Op Ar skip2 47.Sh DESCRIPTION 48The 49.Nm 50utility compares two files of any type and writes the results 51to the standard output. 52By default, 53.Nm 54is silent if the files are the same; if they differ, the byte 55and line number at which the first difference occurred is reported. 56.Pp 57Bytes and lines are numbered beginning with one. 58.Pp 59The options are as follows: 60.Bl -tag -width Ds 61.It Fl l 62Print the byte number (decimal) and the differing 63byte values (octal) for each difference. 64.It Fl s 65Print nothing for differing files; return exit 66status only. 67.El 68.Pp 69The optional arguments 70.Ar skip1 71and 72.Ar skip2 73are the byte offsets from the beginning of 74.Ar file1 75and 76.Ar file2 , 77respectively, where the comparison will begin. 78The offset is decimal by default, but may be expressed as a hexadecimal 79or octal value by preceding it with a leading 80.Dq 0x 81or 82.Dq 0 . 83.Pp 84The 85.Nm 86utility exits with one of the following values: 87.Bl -tag -width 4n 88.It 0 89The files are identical. 90.It 1 91The files are different; this includes the case 92where one file is identical to the first part of 93the other. 94In the latter case, if the 95.Fl s 96option has not been specified, 97.Nm 98writes to standard error that 99.Dv EOF 100was reached in the shorter 101file (before any differences were found). 102.It >1 103An error occurred. 104.El 105.Sh SEE ALSO 106.Xr diff 1 , 107.Xr diff3 1 , 108.Xr sdiff 1 109.Sh STANDARDS 110The 111.Nm 112utility is compliant with the 113.St -p1003.1-2008 114specification. 115.Pp 116The arguments 117.Ar skip1 118and 119.Ar skip2 120are extensions to that specification. 121.Sh HISTORY 122A 123.Nm 124command appeared in 125.At v1 . 126