How to insert tab character when expandtab option is on in Vim

Question

When I'm in insert mode and I have the expandtab option switched on, pressing Tab ↹ results in inserting the configured number of spaces.

But occasionally I want to insert an actual tab character.

Do you know how to do this?

Answer 1

You can use <CTRL-V><Tab> in "insert mode". In insert mode, <CTRL-V> inserts a literal copy of your next character.

If you need to do this often, @Dee`Kej suggested (in the comments) setting Shift+Tab to insert a real tab with this mapping:

:inoremap <S-Tab> <C-V><Tab> 

Also, as noted by @feedbackloop, on Windows you may need to press <CTRL-Q> rather than <CTRL-V>.

Answer 2

You can disable expandtab option from within Vim as below:

:set expandtab! 

or

:set noet 

PS: And set it back when you are done with inserting tab, with "set expandtab" or "set et"

PS: If you have tab set equivalent to 4 spaces in .vimrc (softtabstop), you may also like to set it to 8 spaces in order to be able to insert a tab by pressing tab key once instead of twice (set softtabstop=8).