Linux command--useradd

2. Command format:
   

   useradd [option] User name (option not writable)

4. Command function:

   Create a new user

5. Common options:

   - u Specifies the user ID, but requires that the UID is not used by another user when specified

   - d Specify user account host Directory

   - e Specify user account expiration time, date format: YYYY-MM-DD

   - g Specifies the user's base group (you can use the GID number to represent the group name)

   - g Additional groups for the specified user (you can use the GID number to represent the group name)

   - M does not establish a user host directory

   - s login shell for the specified user

6. Common examples:

   Example one: Creating a user Zhangsan

   Command: useradd Zhangsan

   Note: If you do not add an option, by default, a host directory named after a user name is created in the directory, and a user's initial configuration file is created in that directory, a basic group named after the user name and joined to the group, the system will be/etc/passwd and/etc/ Shadow add the user account record at the end of the two files and log in to the shell for/bin/bash

   Example two: Create an account named Lisi, and specify a base group of wheel, the host directory is/lisi

   Command: useradd-d /lisi-g wheel Lisi

   Note: When specifying a group, the group must exist in the system

   
   

   Example three: Create a user named Wangwu, request to disable login system, do not create the host directory, and the account expires on December 31, 2016

   Command: useradd-m-S /sbin/nologin- e 2016-12-31 Wangwu
   

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Linux command--useradd