让debian在命令行终端显示彩色的文件及文件夹

在debian设置vim颜色与SecureCRT的颜色设置方法讲过怎么设置vim的颜色。但是如果要改系统的文件及文件夹的颜色呢？
这时需要更改”.bashrc”这个文件，我的.bashrc文件是以下这样的..

root@debian:~# vi /root/.bashrc

# ~/.bashrc: executed by bash(1) for non-login shells.
#export PS1='\h:\w\$ '
export PS1='\[\033[1;32;40m\]\u@\h:\w\$ \[\033[0m\]'
umask 022

# You may uncomment the following lines if you want `ls' to be colorized:
 export LS_OPTIONS='--color=auto'
 eval "`dircolors`"
 alias ls='ls $LS_OPTIONS'
 alias ll='ls $LS_OPTIONS -l'
 alias l='ls $LS_OPTIONS -lA'
#
# Some more alias to avoid making mistakes:
# alias rm='rm -i'
# alias cp='cp -i'
# alias mv='mv -i'

改完要退出再登陆，就可以看到了。SecureCRT也是如此。