Convert DOS file to UNIX format

Test file from dos/windoz is annoyingwhen working at linux. The newline character must be converted. Here are a collection of fixes:

Use of vi at linux

open a text file with vi, use this commad (use press Ctrl-V then Ctrl-M to get ^M)

%s/^M//g

Convert DOS file to UNIX format

Type the following command to convert file called myfile.txt:
$ dos2unix myfile.txt

However above command will not make a backup of original file myfile.txt. To make a backup of original file. The original file is renamed with the original filename and a .bak extension. Type the following command:
$ dos2unix -b myfile.txt

Convert UNIX file to DOS format

Type the following command to convert file called myfile.txt:
$ unix2dos myfile.txt
$ unix2dos -b myfile.txt


Convert Dos TO Unix Using tr Command

Type the following command:

tr -d '\r' < input.file > output.file

Convert Dos TO Unix Using Perl One Liner

Type the following command:

perl -pi -e 's/\r\n/\n/g' input.file

in perl script, s/\r\n/\n/ does not work. 
I use s/^M// (press Ctrl-V then Ctrl-M to get pattern)
, but if this is used along with chomp, it may remove more fields then necessary.

Convert UNIX to DOS format using sed command

Type the following command if you are using bash shell:
$ sed 's/$'"/`echo \\\r`/" input.txt > output.txt
Note: sed version may not work under different UNIX/Linux variant,refer your local sed man page for more info.

Convert DOS newlines (CR/LF) to Unix format using sed command

If you are using BASH shell type the following command (press Ctrl-V then Ctrl-M to get pattern or special symbol)
$ sed 's/^M$//' input.txt > output.txt

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