1.\" Copyright (c) 1987, 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. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)cmp.1 8.1 (Berkeley) 6/6/93 32.\" $FreeBSD: src/usr.bin/cmp/cmp.1,v 1.7.2.5 2003/02/24 22:37:41 trhodes Exp $ 33.\" 34.Dd April 10, 2013 35.Dt CMP 1 36.Os 37.Sh NAME 38.Nm cmp 39.Nd compare two files 40.Sh SYNOPSIS 41.Nm 42.Op Fl l | Fl s | Fl x 43.Op Fl z 44.Ar file1 file2 45.Op Ar skip1 Op Ar skip2 46.Sh DESCRIPTION 47The 48.Nm 49utility compares two files of any type and writes the results 50to the standard output. 51By default, 52.Nm 53is silent if the files are the same; if they differ, the byte 54and line number at which the first difference occurred is reported. 55.Pp 56Bytes and lines are numbered beginning with one. 57.Pp 58The following options are available: 59.Bl -tag -width flag 60.It Fl l 61Print the byte number (decimal) and the differing 62byte values (octal) for each difference. 63.It Fl s 64Print nothing for differing files; return exit 65status only. 66.It Fl x 67Like 68.Fl l 69but prints in hexadecimal and using zero as index 70for the first byte in the files. 71.It Fl z 72For regular files compare file sizes first, and fail the comparison if they 73are not equal. 74.El 75.Pp 76The optional arguments 77.Ar skip1 78and 79.Ar skip2 80are the byte offsets from the beginning of 81.Ar file1 82and 83.Ar file2 , 84respectively, where the comparison will begin. 85The offset is decimal by default, but may be expressed as a hexadecimal 86or octal value by preceding it with a leading ``0x'' or ``0''. 87.Sh EXIT STATUS 88The 89.Nm 90utility exits with one of the following values: 91.Bl -tag -width 4n 92.It 0 93The files are identical. 94.It 1 95The files are different; this includes the case 96where one file is identical to the first part of 97the other. 98In the latter case, if the 99.Fl s 100option has not been specified, 101.Nm 102writes to standard error that EOF was reached in the shorter 103file (before any differences were found). 104.It >1 105An error occurred. 106.El 107.Sh COMPATIBILITY 108The 109.Fl x 110and 111.Fl z 112options are extensions to the standard. 113.Sh SEE ALSO 114.Xr diff 1 , 115.Xr diff3 1 116.Sh STANDARDS 117The 118.Nm 119utility is expected to be 120.St -p1003.2 121compatible. 122.Sh HISTORY 123A 124.Nm 125command appeared in 126.At v1 . 127