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dos2unix

Section: 2013-12-30 (1)
Updated: 2013-07-27
Index
 

NAME

dos2unix - DOS/Mac to Unix and vice versa text file format converter  

SYNOPSIS

    dos2unix [options] [FILE ...] [-n INFILE OUTFILE ...]
    unix2dos [options] [FILE ...] [-n INFILE OUTFILE ...]

 

DESCRIPTION

The Dos2unix package includes utilities "dos2unix" and "unix2dos" to convert plain text files in DOS or Mac format to Unix format and vice versa.

In DOS/Windows text files a line break, also known as newline, is a combination of two characters: a Carriage Return (CR) followed by a Line Feed (LF). In Unix text files a line break is a single character: the Line Feed (LF). In Mac text files, prior to Mac OS X, a line break was single Carriage Return (CR) character. Nowadays Mac OS uses Unix style (LF) line breaks.

Besides line breaks Dos2unix can also convert the encoding of files. A few DOS code pages can be converted to Unix Latin-1. And Windows Unicode (UTF-16) files can be converted to Unix Unicode (UTF-8) files.

Binary files are automatically skipped, unless conversion is forced.

Non-regular files, such as directories and FIFOs, are automatically skipped.

Symbolic links and their targets are by default kept untouched. Symbolic links can optionally be replaced, or the output can be written to the symbolic link target. Symbolic links on Windows are not supported. Windows symbolic links always replaced, keeping the targets unchanged.

Dos2unix was modelled after dos2unix under SunOS/Solaris and has similar conversion modes.  

OPTIONS

--
Treat all following options as file names. Use this option if you want to convert files whose names start with a dash. For instance to convert a file named ``-foo'', you can use this command:

    dos2unix -- -foo

Or in new file mode:

    dos2unix -n -- -foo out.txt

-ascii
Convert only line breaks. This is the default conversion mode.
-iso
Conversion between DOS and ISO-8859-1 character set. See also section CONVERSION MODES.
-1252
Use Windows code page 1252 (Western European).
-437
Use DOS code page 437 (US). This is the default code page used for ISO conversion.
-850
Use DOS code page 850 (Western European).
-860
Use DOS code page 860 (Portuguese).
-863
Use DOS code page 863 (French Canadian).
-865
Use DOS code page 865 (Nordic).
-7
Convert 8 bit characters to 7 bit space.
-c, --convmode CONVMODE
Set conversion mode. Where CONVMODE is one of: ascii, 7bit, iso, mac with ascii being the default.
-f, --force
Force conversion of binary files.
-h, --help
Display help and exit.
-k, --keepdate
Keep the date stamp of output file same as input file.
-L, --license
Display program's license.
-l, --newline
Add additional newline.

dos2unix: Only DOS line breaks are changed to two Unix line breaks. In Mac mode only Mac line breaks are changed to two Unix line breaks.

unix2dos: Only Unix line breaks are changed to two DOS line breaks. In Mac mode Unix line breaks are changed to two Mac line breaks.

-m, --add-bom
Write an UTF-8 Byte Order Mark in the output file. Never use this option when the output encoding is other than UTF-8. See also section UNICODE.
-n, --newfile INFILE OUTFILE ...
New file mode. Convert file INFILE and write output to file OUTFILE. File names must be given in pairs and wildcard names should not be used or you will lose your files.

The person who starts the conversion in new file (paired) mode will be the owner of the converted file. The read/write permissions of the new file will be the permissions of the original file minus the umask(1) of the person who runs the conversion.

-o, --oldfile FILE ...
Old file mode. Convert file FILE and overwrite output to it. The program defaults to run in this mode. Wildcard names may be used.

In old file (in-place) mode the converted file gets the same owner, group, and read/write permissions as the original file. Also when the file is converted by another user who has write permissions on the file (e.g. user root). The conversion will be aborted when it is not possible to preserve the original values. Change of owner could mean that the original owner is not able to read the file any more. Change of group could be a security risk, the file could be made readable for persons for whom it is not intended. Preservation of owner, group, and read/write permissions is only supported on Unix.

-q, --quiet
Quiet mode. Suppress all warnings and messages. The return value is zero. Except when wrong command-line options are used.
-s, --safe
Skip binary files (default).
-ul, --assume-utf16le
Assume that the input file format is UTF-16LE.

When there is a Byte Order Mark in the input file the BOM has priority over this option.

When you made a wrong assumption (the input file was not in UTF-16LE format) and the conversion succeeded, you will get an UTF-8 output file with wrong text. You can undo the wrong conversion with iconv(1) by converting the UTF-8 output file back to UTF-16LE. This will bring back the original file.

The assumption of UTF-16LE works as a conversion mode. By switching to the default ascii mode the UTF-16LE assumption is turned off.

-ub, --assume-utf16be
Assume that the input file format is UTF-16BE.

This option works the same as option "-ul".

-F, --follow-symlink
Follow symbolic links and convert the targets.
-R, --replace-symlink
Replace symbolic links with converted files (original target files remain unchanged).
-S, --skip-symlink
Keep symbolic links and targets unchanged (default).
-V, --version
Display version information and exit.
 

MAC MODE

In normal mode line breaks are converted from DOS to Unix and vice versa. Mac line breaks are not converted.

In Mac mode line breaks are converted from Mac to Unix and vice versa. DOS line breaks are not changed.

To run in Mac mode use the command-line option "-c mac" or use the commands "mac2unix" or "unix2mac".  

CONVERSION MODES

Conversion modes ascii, 7bit, and iso are similar to those of dos2unix/unix2dos under SunOS/Solaris.
ascii
In mode "ascii" only line breaks are converted. This is the default conversion mode.

Although the name of this mode is ASCII, which is a 7 bit standard, the actual mode is 8 bit. Use always this mode when converting Unicode UTF-8 files.

7bit
In this mode all 8 bit non-ASCII characters (with values from 128 to 255) are converted to a 7 bit space.
iso
Characters are converted between a DOS character set (code page) and ISO character set ISO-8859-1 (Latin-1) on Unix. DOS characters without ISO-8859-1 equivalent, for which conversion is not possible, are converted to a dot. The same counts for ISO-8859-1 characters without DOS counterpart.

When only option "-iso" is used dos2unix will try to determine the active code page. When this is not possible dos2unix will use default code page CP437, which is mainly used in the USA. To force a specific code page use options "-437" (US), "-850" (Western European), "-860" (Portuguese), "-863" (French Canadian), or "-865" (Nordic). Windows code page CP1252 (Western European) is also supported with option "-1252". For other code pages use dos2unix in combination with iconv(1). Iconv can convert between a long list of character encodings.

Never use ISO converion on Unicode text files. It will corrupt UTF-8 encoded files.

Some examples:

Convert from DOS default code page to Unix Latin-1

    dos2unix -iso -n in.txt out.txt

Convert from DOS CP850 to Unix Latin-1

    dos2unix -850 -n in.txt out.txt

Convert from Windows CP1252 to Unix Latin-1

    dos2unix -1252 -n in.txt out.txt

Convert from Windows CP1252 to Unix UTF-8 (Unicode)

    iconv -f CP1252 -t UTF-8 in.txt | dos2unix > out.txt

Convert from Unix Latin-1 to DOS default code page.

    unix2dos -iso -n in.txt out.txt

Convert from Unix Latin-1 to DOS CP850

    unix2dos -850 -n in.txt out.txt

Convert from Unix Latin-1 to Windows CP1252

    unix2dos -1252 -n in.txt out.txt

Convert from Unix UTF-8 (Unicode) to Windows CP1252

    unix2dos < in.txt | iconv -f UTF-8 -t CP1252 > out.txt

See also <http://czyborra.com/charsets/codepages.html> and <http://czyborra.com/charsets/iso8859.html>.

 

UNICODE

 

Encodings

There exist different Unicode encodings. On Unix and Linux Unicode files are typically encoded in UTF-8 encoding. On Windows Unicode text files can be encoded in UTF-8, UTF-16, or UTF-16 big endian, but are mostly encoded in UTF-16 format.  

Conversion

Unicode text files can have DOS, Unix or Mac line breaks, like regular text files.

All versions of dos2unix and unix2dos can convert UTF-8 encoded files, because UTF-8 was designed for backward compatiblity with ASCII.

Dos2unix and unix2dos with Unicode UTF-16 support, can read little and big endian UTF-16 encoded text files. To see if dos2unix was built with UTF-16 support type "dos2unix -V".

The Windows versions of dos2unix and unix2dos convert UTF-16 encoded files always to UTF-8 encoded files. Unix versions of dos2unix/unix2dos convert UTF-16 encoded files to the locale character encoding when it is set to UTF-8. Use the locale(1) command to find out what the locale character encoding is.

Because UTF-8 formatted text files are well supported on both Windows and Unix, dos2unix and unix2dos have no option to write UTF-16 files. All UTF-16 characters can be encoded in UTF-8. Conversion from UTF-16 to UTF-8 is without loss. UTF-16 files will be skipped on Unix when the locale character encoding is not UTF-8, to prevent accidental loss of text. When an UTF-16 to UTF-8 conversion error occurs, for instance when the UTF-16 input file contains an error, the file will be skipped.

ISO and 7-bit mode conversion do not work on UTF-16 files.  

Byte Order Mark

On Windows Unicode text files typically have a Byte Order Mark (BOM), because many Windows programs (including Notepad) add BOMs by default. See also <http://en.wikipedia.org/wiki/Byte_order_mark>.

On Unix Unicode files typically don't have a BOM. It is assumed that text files are encoded in the locale character encoding.

Dos2unix can only detect if a file is in UTF-16 format if the file has a BOM. When an UTF-16 file doesn't have a BOM, dos2unix will see the file as a binary file.

Use option "-ul" or "-ub" to convert an UTF-16 file without BOM.

Dos2unix never writes a BOM in the output file, unless you use option "-m".

Unix2dos writes a BOM in the output file when the input file has a BOM, or when option "-m" is used.  

Unicode examples

Convert from Windows UTF-16 (with BOM) to Unix UTF-8

    dos2unix -n in.txt out.txt

Convert from Windows UTF-16LE (without BOM) to Unix UTF-8

    dos2unix -ul -n in.txt out.txt

Convert from Unix UTF-8 to Windows UTF-8 with BOM

    unix2dos -m -n in.txt out.txt

Convert from Unix UTF-8 to Windows UTF-16

    unix2dos < in.txt | iconv -f UTF-8 -t UTF-16 > out.txt

 

EXAMPLES

Read input from 'stdin' and write output to 'stdout'.

    dos2unix
    dos2unix -l -c mac

Convert and replace a.txt. Convert and replace b.txt.

    dos2unix a.txt b.txt
    dos2unix -o a.txt b.txt

Convert and replace a.txt in ascii conversion mode.

    dos2unix a.txt

Convert and replace a.txt in ascii conversion mode. Convert and replace b.txt in 7bit conversion mode.

    dos2unix a.txt -c 7bit b.txt
    dos2unix -c ascii a.txt -c 7bit b.txt
    dos2unix -ascii a.txt -7 b.txt

Convert a.txt from Mac to Unix format.

    dos2unix -c mac a.txt
    mac2unix a.txt

Convert a.txt from Unix to Mac format.

    unix2dos -c mac a.txt
    unix2mac a.txt

Convert and replace a.txt while keeping original date stamp.

    dos2unix -k a.txt
    dos2unix -k -o a.txt

Convert a.txt and write to e.txt.

    dos2unix -n a.txt e.txt

Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.

    dos2unix -k -n a.txt e.txt

Convert and replace a.txt. Convert b.txt and write to e.txt.

    dos2unix a.txt -n b.txt e.txt
    dos2unix -o a.txt -n b.txt e.txt

Convert c.txt and write to e.txt. Convert and replace a.txt. Convert and replace b.txt. Convert d.txt and write to f.txt.

    dos2unix -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt

 

RECURSIVE CONVERSION

Use dos2unix in combination with the find(1) and xargs(1) commands to recursively convert text files in a directory tree structure. For instance to convert all .txt files in the directory tree under the current directory type:

    find . -name *.txt |xargs dos2unix

 

LOCALIZATION

LANG
The primary language is selected with the environment variable LANG. The LANG variable consists out of several parts. The first part is in small letters the language code. The second is optional and is the country code in capital letters, preceded with an underscore. There is also an optional third part: character encoding, preceded with a dot. A few examples for POSIX standard type shells:

    export LANG=nl               Dutch
    export LANG=nl_NL            Dutch, The Netherlands
    export LANG=nl_BE            Dutch, Belgium
    export LANG=es_ES            Spanish, Spain
    export LANG=es_MX            Spanish, Mexico
    export LANG=en_US.iso88591   English, USA, Latin-1 encoding
    export LANG=en_GB.UTF-8      English, UK, UTF-8 encoding

For a complete list of language and country codes see the gettext manual: http://www.gnu.org/software/gettext/manual/gettext.html#Language-Codes <http://www.gnu.org/software/gettext/manual/gettext.html#Language-Codes>

On Unix systems you can use to command locale(1) to get locale specific information.

LANGUAGE
With the LANGUAGE environment variable you can specify a priority list of languages, separated by colons. Dos2unix gives preference to LANGUAGE over LANG. For instance, first Dutch and then German: "LANGUAGE=nl:de". You have to first enable localization, by setting LANG (or LC_ALL) to a value other than ``C'', before you can use a language priority list through the LANGUAGE variable. See also the gettext manual: http://www.gnu.org/software/gettext/manual/gettext.html#The-LANGUAGE-variable <http://www.gnu.org/software/gettext/manual/gettext.html#The-LANGUAGE-variable>

If you select a language which is not available you will get the standard English messages.

DOS2UNIX_LOCALEDIR
With the environment variable DOS2UNIX_LOCALEDIR the LOCALEDIR set during compilation can be overruled. LOCALEDIR is used to find the language files. The GNU default value is "/usr/local/share/locale". Option --version will display the LOCALEDIR that is used.

Example (POSIX shell):

    export DOS2UNIX_LOCALEDIR=$HOME/share/locale

 

RETURN VALUE

On success, zero is returned. When a system error occurs the last system error will be returned. For other errors 1 is returned.

The return value is always zero in quiet mode, except when wrong command-line options are used.  

STANDARDS

<http://en.wikipedia.org/wiki/Text_file>

<http://en.wikipedia.org/wiki/Carriage_return>

<http://en.wikipedia.org/wiki/Newline>

<http://en.wikipedia.org/wiki/Unicode>  

AUTHORS

Benjamin Lin - <blin@socs.uts.edu.au> Bernd Johannes Wuebben (mac2unix mode) - <wuebben@kde.org>, Christian Wurll (add extra newline) - <wurll@ira.uka.de>, Erwin Waterlander - <waterlan@xs4all.nl> (Maintainer)

Project page: <http://waterlan.home.xs4all.nl/dos2unix.html>

SourceForge page: <http://sourceforge.net/projects/dos2unix/>

Freecode: <http://freecode.com/projects/dos2unix>  

SEE ALSO

file(1) find(1) iconv(1) locale(1) xargs(1)


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
MAC MODE
CONVERSION MODES
UNICODE
Encodings
Conversion
Byte Order Mark
Unicode examples
EXAMPLES
RECURSIVE CONVERSION
LOCALIZATION
RETURN VALUE
STANDARDS
AUTHORS
SEE ALSO