# Writing Vim's Output to Files

## Changing environment variables in vimrc

Refer to Vim Wiki’s page on environment variables. The tips uses paths in *nix in the examples. However, for Win*, some inexperienced users don’t know whether slashes or backslashes should be used. In fact, backslashes should be used, and the string should be enclosed by a pair of single quote (I don’t know if double quotes work.) Then things should run. If you’re unlucky and receive a runtime error in the next time you start Vim, then it may be due to the missing space characters around the equal sign.

## Writing external commands to files

It’s easy! (:r ![command] will do.)

## Writing variables to files

Use the = register. First get into normal mode, then type the following command.

"=sin(1)p


The p have to be typed before any further changes of contents. Otherwise, it may not work. For details, see Unix & Linux Stack Exchange question 8101.

## Writing internal commands to files

A forum post has answered my doubt. I redirect interested readers to Object Mix.

:redi @+