Linux：-bash: tree: command not found

问题：
Linux下使用tree命令报错

-bash: tree: command not found

解决办法：

yum install tree

tree示例：

 ___________________________
< “solve the tree problem” >
 ---------------------------
   \
    \
        .--.
       |o_o |
       |:_/ |
      //   \ \
     (|     | )
    /'\_   _/`\
    \___)=(___/