Vim: remap key to toggle line numbering

Question

I added:

set number
nnoremap <F2> :set nonumber!

to my vimrc file. Basically what it's supposed to do is let me press F2 to toggle line numbering but it's not working. What have I done wrong?

Answer 1

In your .vimrc, add this:

set number
nnoremap <F2> :set nonumber!<CR>

Then pressing F2 will toggle line numbering.

Answer 2

This is what I use (with a different key binding):

nmap <f2> :set number! number?<cr>

The "number!" toggles the setting and "number?" reports the state.

Answer 3

nmap <silent> <F11> :exec &nu==&rnu? "se nu!" : "se rnu!"<CR>

In new vim you can set both relative number and number at once, this way:

set nu rnu