Ubuntu无法登陆问题

今天修改/etc/environment文件，重启后发现无法登陆进入了，用vssh登陆出现以下错误：

-bash: groups: command not found
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
Command 'lesspipe' is available in the following places
 * /bin/lesspipe
 * /usr/bin/lesspipe
The command could not be located because '/bin:/usr/bin' is not included in the PATH environment variable.
lesspipe: command not found
Command 'dircolors' is available in '/usr/bin/dircolors'
The command could not be located because '/usr/bin' is not included in the PATH environment variable.
dircolors: command not found
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

此时一些例如”ls”的外置命令都无法使用，解决办法：

export PATH=/usr/bin:/bin
sudo vim /etc/environment

然后在里面添加变量：

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games

保存后：

source /etc/environment

问题解决！