在系统中输入命令，报如下错误：
[root@a1 work]# ll
-bash: ls: command not found
临时解决办法：
export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
永久解决办法：
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
使环境变量生效
source /etc/profile
Original: https://www.cnblogs.com/nulige/p/10451392.html
Author: 努力哥
Title: centos找不到环境变量 -bash: ls: command not found
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