Answers for "vim tab width 4 spaces"

vim set tab size

:set tabstop=2 shiftwidth=2 expandtab
:retab

# tabstop		-> Indentation width in spaces
# shiftwidth	-> Autoindentation width in spaces
# expandtab		-> Use actual spaces instead of tabs
# retab			-> Convert existing tabs to spaces

how to enable 4 space tab on vim

set tabstop=4       " The width of a TAB is set to 4.
                    " Still it is a \t. It is just that
                    " Vim will interpret it to be having
                    " a width of 4.
set shiftwidth=4    " Indents will have a width of 4.
set softtabstop=4   " Sets the number of columns for a TAB.
set expandtab       " Expand TABs to spaces.
filetype plugin indent on " Use filetype detection and file-based automatic indenting.

Source: Stackoverflow.com 
Author: Shervin Emami.