Commands for users and groups that are aggregated by Linux commands

1. useradd: Adding Users

   Format: useradd [options] LOGIN

   Parameters:

   -r: Create a System account

   -U: Specify User ID

   -G: Specifies the group ID to which the user belongs

   -C: Add comment information

   -D: Specify the user's home directory

   -S: Specifies the shell used by the user at login

   -G: Specify additional groups to which the user belongs

   -M: Automatically establish the user's log in directory

   Example:

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   Create user Oracle, the additional group belongs to database and Sql,id number 3000, home directory is/home/database

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3. Groupadd: Creating Groups

   Format: groupadd [options] Group

   Parameters:

   -R: Creating a System Group

   -G: Specify the Group ID

3. Userdel/groupdel: Delete user/delete group

Format: Userdel [options] LOGIN

Groupdel Group

Userdel Parameters:

-F: Delete the user home directory and its files

4. Usermod/groupmod: Modify account Properties/modify Group Properties

Format: usermod [options] LOGIN

Parameters:

-C: Modify account comment information

-D: Modify home Directory

-E: Modify the expiration date of the account

-S: Modify account Shell

-F: Change the number of days after password expiration to close the account

-U: Unlock password

-L: Lock user password

-L: Modify the account name (online account is not allowed to modify)

Commands for users and groups that are aggregated by Linux commands