How to map CAPS LOCK key in Vim? This question has already been asked here. The accepted answer says it is not possible. Other answers provide a way to do it on linux but I have not check if it worked. I am most interested in knowing if there is a way to do it for mac (although you can post answers for linux as well). 

I am only reposting this question here because the other question on SOF is more than five years old. Ideally, I would like to remap to &lt;ESC&gt; key to CAPS LOCK.
If you are using the X11 environment, you may achieve what you want
with the following commands:

xmodmap -e 'clear lock'


which means: from now on, Caps_Lock key isn't anymore a keyboard modifier
and fall back to a normal key

xmodmap -e 'keysym Caps_Lock = Escape'


which means: get the keycode of Caps_Lock and from now on assign it the
keysym of Escape.

Note: this receipe works on any Unix.