customizing dircolors doesn't take effect in emacs shell

[Yuan Luo]

Hi,
So I have the following setting for dircolors in my ~/.bashrc. With my customized ~/.dircolors file, a regular terminal shows the desired colors upon ls in the shell. However, within the shell of emacs, it still shows the default colors upon ls. This happens in emacs23, what am I missing?

if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
fi

Thanks,
Yuan