Ubuntu环境变量恢复

问题：系统找不到环境变量

在终端输入:ls 后显示：

root@wei:/etc# ls

Command 'ls' is available in '/bin/ls'

The command could not be located because '/bin' is not included in the PATH environment variable.

ls: command not found

解决办法：

直接在终端输入：export PATH=/usr/bin:/bin

完成后则可以使用相关命令了。