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How To Install and Use dos2unix Command In Linux? – POFTUT Skip to content


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HOW TO INSTALL AND USE DOS2UNIX COMMAND IN LINUX?

13/02/2019 by İsmail Baydan



Different operating systems like Linux and Windows have different text file
formats which are not compatible with each other. While using these platforms to
edit and read text file there will be problems. If we want to use a text file
which is created or edited in Windows or MS-DOS environment in Linux we need to
change the text file into Linux format with the dos2unix tool.


INSTALL DOS2UNIX

As dos2unix tool is a very simple tool we can install it for different Linux
distributions like below easily.


UBUNTU, DEBIAN, MINT, KALI

We will use apt  command and dos2unix package name for installation.

$ sudo apt install dos2unix

dos2unix Ubuntu, Debian, Mint, Kali


FEDORA, CENTOS, REDHAT

We will use dnf command like below.

$ sudo dnf install dos2unix

dos2unix Fedora, CentOS, RedHat


HIDDEN CHARACTERS PROBLEM

As stated previously there are some characters which are not used in Linux text
files but used in Windows text files.

 * End of line is specified with Carriage Return `CR` followed by Line Feed `LF`
   in Windows but In Linux, only Line Feed `LF` is used.
 * Default encoding of Windows Files are UTF-16 but in Linux, UTF-8 is used
 * Binary files are skipped automatically


PRINT GIVEN FILE ENCODING AND TYPE

We will start by listing or printing the given file encoding type and line
terminator type. We will use the Linux file command which provides this
information.

$ file a.txt

Print Given File Encoding and Type

We can see that the file a.txt is encoded with the ISO-8859  and have CRLF or
Windows line terminators.


CONVERT FROM DOS TO UNIX FORMAT

We will start with a simple example where we will convert the file which is
created in the Windows or MS-DOS environment named a.txt into a file which will
be used in the Linux environment. a.txt will be converted as the same file name.



$ dos2unix a.txt

Convert From DOS To Unix Format

After checking with the file command we can see that it is referred to as text
file without CRLF line terminator.

LEARN MORE  What Is Disk Operating System (DOS)?



SPECIFY CONVERSION MODE

While converting there are different conversion modes which provide
alternative about the conversion. We can use the following options and
conversion modes.

 * `-iso` will convert from default code page into Unix Latin-1
 * `-850` will convert from DOS CP850 to Unix Latin-1
 * `-1252` will convert from Windows CP1252 to Unix UTF-8 or Unicode

In this example, we will convert to ASCII format with the -iso option.

$ dos2unix -iso a.txt

Specify Conversion Mode

We can see that detailed information is provided during conversion.


KEEP DATE STAMP OF OLD FILE

Timestamps are file attributes those holds information like creation time,
modification time, access time etc. While converting a text file from DOS format
to Linux format this information will be changed. We can preserve the time stamp
information with the -k option like below.

$ dos2unix -k a.txt


SPECIFY NEW FILE NAME

Up to now we have converted files and replaced. We can specify a new file name
where the converted file content will be written to this new file and old file
will be kept without a change. We will use -o option and specify the new file
name.

In this example, we will create the newly converted file name b.txt.

$ dos2unix -n a.txt b.txt

Specify New File Name


RECURSIVE CONVERT WITH FIND COMMAND

If there are a lot of files to be converted to Unix or Linux text file format
converting them one by one is trivial work. We need to run the bulk operation on
all files. We can use find command which will execute given dos2unix command on
all found files which are specified as txt.




In this example, we will find all text files which is specified with -name
*.txt  in the current working directory which are specified with . and then run
dos2unix command all of these files with the xargs command.

$ find . -name "*.txt" | xargs dos2unix











Categories Blog, CentOS, Debian, Fedora, Kali, Linux, Mint, RedHat, Ubuntu Tags
carriage return, convert file, dos, dos txt, dos2unix, line feed, msdos, unix,
unix txt, unix2dos
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