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unix2dos & dos2unix
Original author(s)	John Birchfield
Developer(s)	Benjamin Lin, Bernd Johannes Wuebben, Christian Wurll, Erwin Waterlander
Initial release	1989; 35 years ago (1989)
/ 22 January 2024; 8 days ago (22 January 2024)

Repository	git.code.sf.net/p/dos2unix/dos2unix
Operating system	Unix-like, DOS, OS/2, Windows
Platform	Cross-platform
Type	Command
License	FreeBSD style license
Website	waterlan.home.xs4all.nl/dos2unix.html

unix2dos (sometimes named todos or u2d) is a tool to convert line breaks in a text file from Unix format (Line feed) to DOS format (carriage return + Line feed) and vice versa. When invoked as unix2dos the program will convert a Unix text file to DOS format, when invoked as dos2unix it will convert a DOS text file to Unix format. ^[2]

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Usage

Unix2dos and dos2unix are not part of the Unix standard. Commercial Unixes usually come with their own implementation of unix2dos/dos2unix, like SunOS/Solaris's dos2unix/unix2dos, HP-UX's dos2ux/ux2dos and Irix's to_unix/to_dos.

There exist many open source alternatives with different command names and options like dos2unix/unix2dos, d2u/u2d, fromdos/todos, endlines, flip. The multi-call binary busybox includes an implementation of unix2dos/dos2unix.

See the manual page of the respective commands.

Alternatives to unix2dos conversion

recode
```
$ recode latin1..dos file
```
Open the file with Windows Write (WordPad) or Microsoft Word, and save in "plain text" format.
Similar results can be achieved with different Unix tools to change the trailing newline '\n' to a combination of carriage return and newline characters '\r\n', for example with perl or the GNU implementation of sed in-line editing:
- $ perl -i -p -e 's|[\r\n]+|\r\n|g' file
- $ sed -i -e 's/\r*$/\r/' file

Alternatives to dos2unix conversion

For the opposite conversion (dos2unix) it is possible to use, for example, the utility tr with the -d '\r' flag to remove the carriage return characters:

$ tr -d '\r' < file > file2 # For ASCII and other files which do not contain multibyte characters (Not utf-8 safe).
$ perl -i -p -e 's/\r//g' file
$ sed -i -e 's/\r//g' file

Note: The above method assumes there are only DOS line breaks in the input file. Any Mac line breaks (\r) present in the input will be removed.

An alternative to the dos2unix conversion is possible by using the col command that is available on Linux and other Unix-like operating systems, including Mac OS X. In the following case, InFile contains the undesired DOS (^M) line endings. After execution, OutFile is either created or replaced, and contains UNIX line endings. The -b option tells col not to output backspace characters.

$ col -b < InFile > OutFile

References

^ "dos2unix / unix2dos - Text file format converters". Retrieved 30 January 2024.
^ A practical guide to Linux. Mark G. Sobell ISBN 0-13-147823-0 Page 55

External links

Tofrodos - software that provides dos2unix and unix2dos
Dos2Unix - Dos2Unix / Unix2Dos - Text file format converters

v t e Unix command-line interface programs and shell builtins
File system	cat chattr chmod chown chgrp cksum cmp cp dd du df file fuser ln ls mkdir mv pax pwd rm rmdir split tee touch type umask
Processes	at bg crontab fg kill nice ps time
User environment	env exit logname mesg talk tput uname who write
Text processing	awk basename comm csplit cut diff dirname ed ex fold head iconv join m4 more nl paste patch printf read sed sort strings tail tr troff uniq vi wc xargs
Shell builtins	alias cd echo test unset wait
Searching	find grep
Documentation	man
Software development	ar ctags lex make nm strip yacc
Miscellaneous	bc cal expr lp od sleep true and false
Categories Standard Unix programs Unix SUS2008 utilities List

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This page was last edited on 30 January 2024, at 19:32

unix2dos

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