How to use only tab (not space) in vim

Question

I prefer to use tab than white space(may be a little different from most of others)

But I found, when I hit Enter at the end of li

Answer 1

The settings you are looking for are:

set autoindent
set noexpandtab
set tabstop=4
set shiftwidth=4

As single line:

set autoindent noexpandtab tabstop=4 shiftwidth=4

autoindent can be replaced with smartindent or cindent, depending upon your tastes. Also look at filetype plugin indent on.

http://vim.wikia.com/wiki/Indenting_source_code