Replacing 0 with NA - an evergreen from the list

This thread from the R-help list describe an evergreen tip that, at least once, is proved useful in R practice.

Replacing Tabs with spaces and back in VIM

Not specifically R-related.
If you need to remove all the blank spaces from a file and replace them with tabs for easy importing in R, you can do it in VIM in no time. In normal mode type:

:set noexpandtab
:%retab!

The full story here