How to create a user and specify a user group in Linux

linuxCreate a user and specify a user group

1. View all users

cat /etc/passwd

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:

• -u UID: Specify UID, this UID must be greater than or equal to 500, and there is no UID occupied by other users

• -g GID/GROUPNAME: Specify the default group, which can be GID or GROUPNAME, and must also exist

• -G GROUPS: Specify additional groups

• -c COMMENT: Specify the user’s comment information

• -d PATH: Specify the user’s home directory

useradd  user3  #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

• ##id

  command can view the UID and GID of a user, for example: id user4

• finger

  command can view the user’s main Directory, startup shell, user name, address, phone number and other information. Example: finger user4

##groups
• command to view the groups to which the user belongs, for example: groups root
  2. Use the gpasswd command to add users to the group.

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

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

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

[root@zhz home]# groupadd monster

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

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