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在命令行输入：
export PATH=$PATH:/usr/bin:/usr/sbin:/bin:/sbin:/usr/X11R6/bin
想要永久添加环境变量，步骤如下：
1.在~/.bashrc文件末尾添加如下：
PATH = $PATH:/usr/bin:/usr/sbin:/bin:/sbin:/usr/X11R6/bin
export PATH
保存；
2.在命令行输入：
source ~/.bashrc
3.命令行输入：
echo $PATH
显示环境变量添加成功。
如果修改所有用户的变量信息，则需要编辑：/etc/profile
nano /etc/profile
增加一行：
export PATH=$PATH:/usr/bin:/usr/sbin:/bin:/sbin:/usr/X11R6/bin
然后执行：
source /etc/profile
这样就可以了
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@ 权限问题，试试sudo 再加命令。
你好提示Permission denied 怎么办啊