centos找不到環境變量 -bash: ls: command not found(親測)

#在系統中輸入命令，報如下錯誤：

[root@a1 work]# ll
-bash: ls: command not found

#臨時解決辦法：
export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

o

export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

 

#永久解決辦法：

export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

or
echo "export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/roobo/server/mysql/bin:/root" >>/etc/profile

#使環境變量生效

source /etc/profile

來源:https://www.cnblogs.com/nulige/p/10451392.html