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linuxCreate a user and specify a user group
1. View all users
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Home Operation and Maintenance Linux Operation and Maintenance How to create a user and specify a user group in Linux

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

May 17, 2023 pm 10:55 PM
linux

    linuxCreate a user and specify a user group

    1. View all users

    cat /etc/passwd

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

    ##Every The first line is the username.

    About uid: 0 represents the administrator (root), 1 - 500 represents the system user, 501 - 65535 represents the ordinary user

    cat /etc/group is used to view all user groups. Similar to viewing users

    2. Add users

    groupadd zhangsangroup   #創(chuàng)建用戶組zhangsangroup
    useradd -g zhangsan zhangsan  創(chuàng)建用戶zhangsan并加入zhangsangroup組

    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

    3. Modify user password

    passwd zhangsan

    4. Related commands

    1. Other user operation commands

    useradd  user3  #新增用戶
    usermod –l u1 user1  #將用戶user1的登錄名改為u1
    usermod –d /users/us1 user1   #將用戶 user1家目錄改為/users/us1
    usermod –g users user1 #將用戶user1加入到 users組中,
    userdel user3  #刪除用戶
    userdel –r user3  #刪除用戶并刪除家目錄
    groupadd users #添加一個用戶組users
    groupmod –n user users    #修改組名user為users
    groupdel users    刪除組users

    # The
    • ##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.
    Only root and group administrators can change the members of the group:

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

    3. Modify file permissions chmod

    chmod -R 777 /var/lib/mysql   #表示修改文件為最高權限

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

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

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

    Format: chown [option]...[owner][:[group]] File...

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

    linuxCreate a user and determine the group the user belongs to

    1. Create the group monster

    [root@zhz home]# groupadd monster

    2. Create the user tom, and the group tom belongs to is monster

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

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