Vim Indentation Using ">"

I'm using vim under Mac OS 10.7 Terminal.

My .vimrc already specify the tabstop to be 4. However, if I use shift to select mu开发者_运维百科ltiple lines and then using ">" to indent, it will give me a indention of 8 spaces instead of 4. How can I correct that to be 4?

Part of my .vimrc:

set cindent
set autoindent
set tabstop=4

The shiftwidth variable controls the indentation:

set shiftwidth=4

set shiftwidth=4

They're different things: tabstop says how many spaces wide to use when displaying a tab character, shiftwidth is for indentation.