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If I open files I created in Windows, the lines all end with ^M.
How do I delete these characters all at once?

Answer:

dos2unix is a commandline utility that will do this, or :%s/^M//g will if you use Ctrl-v Ctrl-m to input the ^M, or you can :set ff=unix and vim will do it for you.

Docs on the 'fileformat' setting are here, and the vim wiki has a comprehensive page on line ending conversions.

Alternately, if you move files back and forth a lot, you might not want to convert them, but rather to do :set ff=dos, so vim will know it's a DOS file and use DOS conventions for line endings.

Source: Stack OverflowThis wiki page is deprecated. You can find this documentation on our new documentation site: https://research-computing.git-pages.rit.edu/docs/convert_dos_line_endings_to_unix.html