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. 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.\" @(#)cmp.1 8.1 (Berkeley) 6/6/93 36.\" $FreeBSD$ 37.\" 38.Dd December 19, 2006 39.Dt CMP 1 40.Os 41.Sh NAME 42.Nm cmp 43.Nd compare two files 44.Sh SYNOPSIS 45.Nm 46.Op Fl l | s | x 47.Op Fl hz 48.Ar file1 file2 49.Op Ar skip1 Op Ar skip2 50.Sh DESCRIPTION 51The 52.Nm 53utility compares two files of any type and writes the results 54to the standard output. 55By default, 56.Nm 57is silent if the files are the same; if they differ, the byte 58and line number at which the first difference occurred is reported. 59.Pp 60Bytes and lines are numbered beginning with one. 61.Pp 62The following options are available: 63.Bl -tag -width indent 64.It Fl h 65Do not follow symbolic links. 66.It Fl l 67Print the byte number (decimal) and the differing 68byte values (octal) for each difference. 69.It Fl s 70Print nothing for differing files; return exit 71status only. 72.It Fl x 73Like 74.Fl l 75but prints in hexadecimal and using zero as index 76for the first byte in the files. 77.It Fl z 78For regular files compare file sizes first, and fail the comparison if they 79are not equal. 80.El 81.Pp 82The optional arguments 83.Ar skip1 84and 85.Ar skip2 86are the byte offsets from the beginning of 87.Ar file1 88and 89.Ar file2 , 90respectively, where the comparison will begin. 91The offset is decimal by default, but may be expressed as a hexadecimal 92or octal value by preceding it with a leading ``0x'' or ``0''. 93.Sh EXIT STATUS 94The 95.Nm 96utility exits with one of the following values: 97.Bl -tag -width 4n 98.It 0 99The files are identical. 100.It 1 101The files are different; this includes the case 102where one file is identical to the first part of 103the other. 104In the latter case, if the 105.Fl s 106option has not been specified, 107.Nm 108writes to standard error that EOF was reached in the shorter 109file (before any differences were found). 110.It >1 111An error occurred. 112.El 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