Linux 用户管理

1. 添加用户

[root@iZ945dmdudwZ home]# id lili  --用户是否存在
id: lili: no such user
[root@iZ945dmdudwZ home]# useradd lili  --添加用户
[root@iZ945dmdudwZ home]# id lili
uid=1003(lili) gid=1004(lili) groups=1004(lili)
[root@iZ945dmdudwZ home]# grep lili /etc/passwd /etc/group  --查看添加效果
/etc/passwd:lili:x:1003:1004::/home/lili:/bin/bash
/etc/group:lili:x:1004:
说明：用户添加账号完成会默认创建一个同名的组加入该用户

2. 删除用户
[root@iZ945dmdudwZ home]# id lili
uid=1003(lili) gid=1004(lili) groups=1004(lili)
[root@iZ945dmdudwZ home]# userdel -r lili  --删除用户
[root@iZ945dmdudwZ home]# id lili
id: lili: no such user

3. 添加组
[root@iZ945dmdudwZ home]# grep sales /etc/group
[root@iZ945dmdudwZ home]# groupadd sales
[root@iZ945dmdudwZ home]# grep sales /etc/group
sales:x:1004:

4. 删除组
groupdel sales

5. 密码管理
使用useradd 命令添加账号，默认会锁定用户的密码，如此，用户会暂时不能使用该linux,需要修改密码后，新建的用户才能用他的账号登陆linux

[root@iZ945dmdudwZ home]# passwd -S lili
lili LK 2015-08-14 0 99999 7 -1 (Password locked.)
[root@iZ945dmdudwZ home]# echo "passwdtest" |passwd --stdin lili
Changing password for user lili.
passwd: all authentication tokens updated successfully.
[root@iZ945dmdudwZ home]# passwd -S lili
lili PS 2015-08-14 0 99999 7 -1 (Password set, SHA512 crypt.)

6. 指派组管理员
[root@iZ945dmdudwZ home]# groupadd sales
[root@iZ945dmdudwZ home]# grep sales /etc/group /etc/gshadow
/etc/group:sales:x:1005:
/etc/gshadow:sales:!::
[root@iZ945dmdudwZ home]# gpasswd -A lili,jwt sales
[root@iZ945dmdudwZ home]# grep sales /etc/group /etc/gshadow
/etc/group:sales:x:1005:
/etc/gshadow:sales:!:lili,jwt:
[root@iZ945dmdudwZ home]# gpasswd -A '' sales
[root@iZ945dmdudwZ home]# grep sales /etc/group /etc/gshadow
/etc/group:sales:x:1005:
/etc/gshadow:sales:!::

7. 组员管理
[root@iZ945dmdudwZ home]# id jwt
uid=1002(jwt) gid=1002(jwt) groups=1002(jwt)
[root@iZ945dmdudwZ home]# gpasswd -a jwt sales
Adding user jwt to group sales
[root@iZ945dmdudwZ home]# id jwt
uid=1002(jwt) gid=1002(jwt) groups=1002(jwt),1005(sales)
[root@iZ945dmdudwZ home]# gpasswd -d jwt sales
Removing user jwt from group sales
[root@iZ945dmdudwZ home]# id jwt
uid=1002(jwt) gid=1002(jwt) groups=1002(jwt)