What's the Windows command shell equivalent of Bash's `true` command?

Question

I have written a Vim plugin which shells out to run external commands. Two of the commands I run are diff and grep which can each exit with a non-z

Answer 1

VER>NUL

works for me.

For example,

MKDIR . || VER>NUL

issues an error message, but it sets %ERRORLEVEL% to 0.