Cacher is the code snippet organizer for pro developers

Assumed that I'm editing hello.txt.

:w world.txt will write hello.txt's content to the file world.txt while keeping hello.txt as the opened buffer in vim.
:sav world.txt will first write hello.txt's content to the file world.txt, then close buffer hello.txt, finally open world.txt as the current buffer.

http://stackoverflow.com/a/9927057/87972