4. 讓ll可以使用

1. 編輯設定檔：

   vi ~/.bashrc 

2. 把註解取消

   # 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'
   

3. 重新登出登入後就會生效。