Some instructions and commands for creating users and specifying user groups in Linux

linuxCreate users and specify user groups 1. View all users

cat /etc/passwd

Copy after login

The first thing in each line is the user name.

About uid: 0 means administrator (root) linux sets the default gateway, 1-500 means system userlinux create user command, 501-65535 means ordinary user

cat/etc/group is used to view all user groups, similar to viewing users

2. Add user

groupadd zhangsangroup #创建用户组zhangsangroup useradd -g zhangsan zhangsan创建用户zhangsan并加入zhangsangroup组

Copy after login

useradd parameters:

3. Change user password

passwdzhangsan

4. Related commands

1. Other user operation commands

useradduser3#新增用户 usermod –l u1 user1#将用户user1的登录名改为u1 usermod –d /users/us1 user1 #将用户 user1家目录改为/users/us1 usermod –g users user1 #将用户user1加入到 users组中， userdel user3#删除用户 userdel –r user3#删除用户并删除家目录 groupadd users #添加一个用户组users groupmod –n user users#修改组名user为users groupdel users删除组users

Copy after login

2. The gpasswd command adds users to the group

Only root and group administrators can change the members of the group:

gpasswd –a user1 users#把 user1加入users组 gpasswd –d user1 users #把 user1退出users组

Copy after login

3. Modify file permissions chmod

chmod -R 777 /var/lib/mysql #表示修改文件为最高权限

Copy after login

-R means processing all files in the specified directory and its subdirectories

4. Modify the user and group chown of the file (note: owner first, group last)

chown -R mysql:mysql /var/lib/mysql

Copy after login

Format: chown[options]...[owner][:[group]]file...

-R means processing all files in the specified directory and its subdirectories

linux创建用户linux创建用户命令，并确定该用户所在组

1、创建组monster

[root@zhz home]# groupadd monster

登陆后复制

2、创建用户tomadobe air linux，tom所在组为monster

[root@zhz home]# useradd -g monster tom

登陆后复制

The above is the detailed content of Some instructions and commands for creating users and specifying user groups in Linux. For more information, please follow other related articles on the PHP Chinese website!