Detailed explanation of user and group management commands

Command Parameter Description
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useradd is used to create new users
　 -d specifies the user's home directory (default is /home/username)
　 -D displays the default value
　 -e specifies the expiration date of the new account, in the format "YYYY-MM-DD"
　 -g specifies An initial user group (must already exist)
　-G specifies one or more extended user groups
　-N does not create a user group with the same name
　-s specifies the default login shell
　-u specifies the user UID

passwd is used to modify the user's password
　-l locks the user and prohibits his/her login
　-u unlocks the lock and allows the user to log in
　--stdin allows the user's password to be modified from the standard input
 -d makes the account passwordless
 -e forces the user to change the password the next time they log in
-S displays the user's password status

userdel is used to delete the user
-f forces the user to be deleted , home directory and its related files
　-r Delete the user, home directory, mail pool

usermod is used to modify the user's attributes
　-c Fill in the remark information of the account
　-d -m - m is used with -d to re-specify the user's home directory and automatically transfer new data there
-e Account expiration time, format "YYYY-MM-DD"
-g Change the user group to which it belongs
 -G Change the extended user group
 -L Lock the user and prohibit them from logging into the system
-U Unlock the user and allow them to log in to the system
-s Change the user's login shell
-u Modify the user's UID

　groupadd is used to create groups

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