Unix to Dos [How to write Control Character in Unix File]

Suppose following is your file. If you move the file from Windows to Unix, you will see Control M (^M) character at the end of each line.
File in Windows:
export USERNAME
export PASSWORD
export CTLPATH

Same File when you move it to Unix
export USERNAME^M
export PASSWORD^M
export CTLPATH^M
^M

You can see the special characters because Windows has [Carriage Return Line Feed] CRLF (\r\n) as line terminating sequence. Where as Unix has only [Line Feed] LF (\n) as line terminator.

So, when we move file from Dos (Windows) to Unix, we need some kind of special processing which will convert CRLF into LF.

One is to open the file and replace Control M character visible in file to blank. To replace Control M character one should know how to create Control M character in Unix.

Folloing is the way to create Control M character in Unix.

Open File in vi editor.

Come in Instert mode by pressing Esc i
Press Control V
Then Press Control M
Then Esc.

It will generate Control M.

Whatever control character you want to generate, first press Control + V and then Control +

So convert file from Dos to Unix follow the steps mentioned below:

Open file in vi.
Type following command.
:0,$s/^M//

The above command will remove Control M (^M) character from entire file.

I will mention other utilities to convert from Dos to Unix sometime later.