Convert DOS line endings to Linux line endings in Vim
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.
There is documentation on the fileformat setting, 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.
Change the line endings in the view:
:e ++ff=dos:e ++ff=mac:e ++ff=unixThis can also be used as saving operation (:w alone will not save using the line endings you see on screen):
:w ++ff=dos:w ++ff=mac:w ++ff=unixAnd you can use it from the command-line:
for file in *.cppdo vi +':w ++ff=unix' +':q' "$file"done