32.2.2. Adding a User
To add a user to the system:
Command line options for
useradd are detailed in Table 32.1, “useradd Command Line Options”.
| Option | Description |
|---|---|
-c '<comment>' | <comment> can be replaced with any string. This option is generally used to specify the full name of a user. |
-d <home-dir> | Home directory to be used instead of default /home/<username>/ |
-e <date> | Date for the account to be disabled in the format YYYY-MM-DD |
-f <days> | Number of days after the password expires until the account is disabled. If 0 is specified, the account is disabled immediately after the password expires. If -1 is specified, the account is not be disabled after the password expires. |
-g <group-name> | Group name or group number for the user's default group. The group must exist prior to being specified here. |
-G <group-list> | List of additional (other than default) group names or group numbers, separated by commas, of which the user is a member. The groups must exist prior to being specified here. |
-m | Create the home directory if it does not exist. |
-M | Do not create the home directory. |
-n | Do not create a user private group for the user. |
-r | Create a system account with a UID less than 500 and without a home directory |
-p <password> | The password encrypted with crypt |
-s | User's login shell, which defaults to /bin/bash |
-u <uid> | User ID for the user, which must be unique and greater than 499 |
