I got my hands on a file containing OS/X line-endings (\r), which needed to be converted into Unix line-endings (\n).
Normally I would just do a simple search and replace, with:
- :%s/\r/\n/g
Oddly enough, this actually gave me null-characters (0x00) instead of the expected \n. After some browsing, this seems to be the correct command:
- :%s/\r/\r/g
I have no clue why, and this seems wrong to me, as this command should not have any effect (replacing \r with \r). But yea, it worked :S

spannend stuk.. we begrijpen het helemaal
in your vimrc:
:set fileformats=mac,unix,dos
then when you get a problematic file:
:set fileformat=unix
to convert the line endings.
Thats smart, thanks!
Still confused about the fact that the latter replace worked though.. Maybe it actually has something to do with that fileformat setting.
Evert
A minor correction: OS X uses Unix-standard \n line-endings. OS 9 used \r line-endings.
Thank you for this. I have been using :set fileformat=dos for a while but that felt hacky. This worked like a charm. Thanks!
Now I know what was wrong. Thanks for the help. For some crazy reason, it works and that's all that matters.
KeeKee