Vi, Vim, Vscode editors

VI or VIM

drop to bash

:!bash   or   :!sh

edit other file

:e file.txt    #autocomplite works

redirect command STDOUT to the current edited file in the cursor position

:r!dir

show line number

:set number    or  :set nu

VIM only

Split

:split   or   :vsplit

C^w, c -close current window C^w, C^w - switch between windows