gdiffmk(1)
NAME
SYNOPSIS
gdiffmk [ -aaddmark ] [ -cchangemark ] [ -ddeletemark ] [ -D [ -B ]
[ -Mmark1 mark2 ] ] [ -xdiffcmd ] [ -- ] [ --help ]
[ --version ] file1 file2 [ output ]
DESCRIPTION
gdiffmk compares two groff(1), nroff(1), or troff(1) documents, file1 and file2, and creates an output which is file2 with added `margin character' (.mc) commands that indicate the differences. If the output filename is present, the output is written there. If it is - or absent the output is written to the standard output. If the file1 or file2 argument is - the standard input is read for that input. Clearly both cannot be -. Note that the output is not necessarily compatible with all macro packages and all preprocessors. See the BUGS section below.
OPTIONS
-aaddmark
Use the addmark for source lines not in file1 but present in
file2. Default: +.
-B By default, the deleted texts marked by the -D option end with
an added troff break command, .br, to ensure that the deletions
are marked properly. This is the only way to guarantee that
deletions and small changes get flagged. This option directs
the program not to insert these breaks; it makes no sense to use
it without -D.
-cchangemark
Use the changemark for changed source lines. Default: |.
-ddeletemark
Use the deletemark for deleted source lines. Default: *.
-D Show the deleted portions from changed and deleted text.
Default delimiting marks: [[ ... ]].
-Mmark1 mark2
Change the delimiting marks for the -D option. It makes no
sense to use this option without -D.
-xdiffcmd
Use the diffcmd command to perform the comparison of file1 and
file2. In particular, diffcmd should accept the GNU diff -Dname
option. Default: diff(1).
-- All the following arguments are treated as file names, even if
they begin with -.
--help Print a usage message on standard error output and exit.
--version
Print version information on the standard output and exit.
BUGS
The output is not necessarily compatible with all macro packages and all preprocessors. A workaround that is often successful against preprocessor problems is to run gdiffmk on the output of all the preprocessors instead of the input source. gdiffmk relies on the -Dname option of GNU diff(1) to make a merged `#ifdef' output format. It hasn't been tested whether other versions of diff(1) do support this option. See also the -xdiffcmd option. Report bugs to bug-groff@gnu.org. Include a complete, self-contained example that will allow the bug to be reproduced, and say which version of gdiffmk you are using.
COPYRIGHT
Copyright 2004-2014 Free Software Foundation, Inc. This file is part of the gdiffmk utility, which is part of groff, a free software project. You can redistribute and/or modify gdiffmk under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. gdiffmk is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.
AUTHORS
This document was written and is maintained by Mike Bianchi
SEE ALSO
groff(1), nroff(1), gtroff(1), diff(1)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
