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Comparing and Merging Files
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This manual is for GNU Diffutils (version 3.7, 7 January 2018), and
documents the GNU 'diff', 'diff3', 'sdiff', and 'cmp' commands for
showing the differences between files and the GNU 'patch' command for
using their output to update files.

   Copyright (C) 1992-1994, 1998, 2001-2002, 2004, 2006, 2009-2018 Free
Software Foundation, Inc.

     Permission is granted to copy, distribute and/or modify this
     document under the terms of the GNU Free Documentation License,
     Version 1.3 or any later version published by the Free Software
     Foundation; with no Invariant Sections, no Front-Cover Texts, and
     no Back-Cover Texts.  A copy of the license is included in the
     section entitled "GNU Free Documentation License."

Overview

Preliminary information.

Comparison

What file comparison means.

Output Formats

Formats for two-way difference reports.

Incomplete Lines

Lines that lack trailing newlines.

Comparing Directories

Comparing files and directories.

Adjusting Output

Making 'diff' output prettier.

diff Performance

Making 'diff' smarter or faster.

Comparing Three Files

Formats for three-way difference reports.

diff3 Merging

Merging from a common ancestor.

Interactive Merging

Interactive merging with 'sdiff'.

Merging with patch

Using 'patch' to change old files into new ones.

Making Patches

Tips for making and using patch distributions.

Invoking cmp

Compare two files byte by byte.

Invoking diff

Compare two files line by line.

Invoking diff3

Compare three files line by line.

Invoking patch

Apply a diff file to an original.

Invoking sdiff

Side-by-side merge of file differences.

Standards conformance

Conformance to the POSIX standard.

Projects

If you've found a bug or other shortcoming.

Copying This Manual

How to make copies of this manual.

Translations

Available translations of this manual.

Index

Index.