How to use the dos2unix command

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The os2unix command is used to convert text files in DOS format to UNIX format (DOS/MAC to UNIX text file format converter). The text file under DOS is marked with\ r\ nas a line breaker, which is 0D 0A in hexadecimal. The text file under Unix uses\ nas the line break flag, which is 0A in hexadecimal. Text files in DOS format are under Linux, and ^ M appears at the end of the line when opened with an earlier version of vi, and many commands do not handle this format very well, if it is a shell script. On the other hand, text files in Unix format will be displayed together when opened with Notepad under Windows. Therefore, there is a need to convert the two format files to each other, and the corresponding unix2dos command is to convert the UNIX format text file to DOS format.

1. Install dos2unix

Command: yum install-y dos2unix

Check to see if it is installed before installation:

[root@hadoop002 ~] # rpm-qa | grep-I dos2unix

[root@hadoop002 ~] #

If the instructions are not printed, they are not installed. Execute the command: yum install-y dos2unix to install.

Check again after the installation is complete:

[root@hadoop002 ~] # rpm-qa | grep-I dos2unix

Dos2unix-3.1-37.el6.x86_64

[root@hadoop002 ~] #

2. Dos2unix syntax:

Dos2unix [- hkqV] [- c convmode] [- o file...] [- n infile outfile...]

Parameter description:

-k: keep the date of the output file unchanged

-Q: quiet mode, no warning message.

-V: view version

-c: conversion patterns. Patterns are: ASCII, 7bit, ISO, Mac. Default is: ASCII.

-o: write to the source file

-n: write to a new file

3. Example

3.1 convert one file at a time

Dos2unix-k file

3.2 convert multiple files at a time

Dos2unix-k file1 file2 file3 or dos2unix-k-o file1 file2 file3

3.3 Save the results of the conversion in the new file, while the source file remains unchanged

Dos2unix-k-n oldfile newfile

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