centos7切换组
[*]添加组密码：
gpasswdroot
http://i2.运维网.com/images/blog/201805/20/e285d35a39cab4967ddc6bea5abf295b.png
[*]切换组：
newgrproot
http://i2.运维网.com/images/blog/201805/20/d0c24a36c2956057727bdb6ed47414dd.png
http://i2.运维网.com/images/blog/201805/20/3ce526f68741a412a989db1271adcd86.png
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