useradd: 添加用户、userdel:删除用户账户
[root@localhost root]# useradd dingzhaoling
[root@localhost root]# useradd sunjiye
[root@localhost root]# useradd zhangsan
[root@localhost root]# useradd lisi
[root@localhost root]# useradd wangwu
[root@localhost root]# userdel dingzhaoling
usermod: 修改用户
[root@localhost root]# groupadd u7
[root@localhost root]# usermod -g u7 dingzhaoling
[root@localhost root]# usermod -g u7 sunjiye
[root@localhost root]# usermod -g u7 zhangsan
[root@localhost root]# usermod -g u7 lisi
[root@localhost root]# usermod -g u7 wangwu
passwd:设定密码
[root@localhost root]# passwd -i 030405200 dingzhaoling
Adjusting aging data for user dingzhaoling.
passwd: Success
[root@localhost root]#