The Windows text editors place ^M at the end of each line, which is the visual representation for 0x0D, while Unix based systems place 0x0A, in text files.
1. To remove the ^M character, in ViM, write the following in the command mode and press :w to save the changes:
:set fileformat=unix
2. Or, type this script in ViM, in the command mode and type :w to save the changes:
:1,$s/^V^M//g
3. With sed:
$ sed 's/^M//g' filename > newfilename
4. With Dos2Unix:
$ dos2unix filename newfilename
5. With col:
$ cat filename | col -b > newfilename