Vim: run some command when editing a specific file

Question

I want my Vim to run some commands, for example setlocal spell spelllang=en_us , when I edited a file with the extension en , for example. abc.en How to implement this?

Answer 1

  augroup spell_settings au! " set en_us as default language (unknown extension): au BufEnter * setlocal spell spelllang=en_us " set en_us for en files specifically: au BufEnter *.en setlocal spell spelllang=en_us " to add multiple commands just append: au BufEnter *.en setlocal syntax on augroup END