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man pages section 1: User Commands     Oracle Solaris 10 8/11 Information Library
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Preface

Introduction

User Commands

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cmp

- compare two files

Synopsis

cmp  [-l] [-s] file1 file2 [skip1] [skip2]

Description

The cmp utility compares two files. cmp will write no output if the files are the same. Under default options, if they differ, it writes to standard output the byte and line numbers at which the first difference occurred. Bytes and lines are numbered beginning with 1. If one file is an initial subsequence of the other, that fact is noted. skip1 and skip2 are initial byte offsets into file1 and file2 respectively, and may be either octal or decimal; a leading 0 denotes octal.

Options

The following options are supported:

-l

Write the byte number (decimal) and the differing bytes (octal) for each difference.

-s

Write nothing for differing files; return exit statuses only.

Operands

The following operands are supported:

file1

A path name of the first file to be compared. If file1 is -, the standard input will be used.

file2

A path name of the second file to be compared. If file2 is -, the standard input will be used.

If both file1 and file2 refer to standard input or refer to the same FIFO special, block special or character special file, an error results.

Usage

See largefile(5) for the description of the behavior of cmp when encountering files greater than or equal to 2 Gbyte (231 bytes).

Examples

Example 1 Comparing files byte for byte

The following example:

example% cmp file1 file2 0 1024

does a byte for byte comparison of file1 and file2. It skips the first 1024 bytes in file2 before starting the comparison.

Environment Variables

See environ(5) for descriptions of the following environment variables that affect the execution of cmp: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.

Exit Status

The following error values are returned:

0

The files are identical.

1

The files are different; this includes the case where one file is identical to the first part of the other.

>1

An error occurred.

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
SUNWcsu
CSI
enabled
Interface Stability
Standard

See Also

comm(1), diff(1), attributes(5), environ(5), largefile(5), standards(5)