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

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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 user linux 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

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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

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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

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3. Modify file permissions chmod

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

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-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

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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

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

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

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