❑ useradd(/etc/default/useradd) : This is the file to set the default values of passwd and shadow that is used in creating an account.
* Useradd command references /etc/login.defs(Link) and /etc/default/useradd when creates an user account.
❑ You can modify the useradd file directly or use useradd command to modify the file.
* useradd -D [Option] [Argument]
| Option | Description |
| -b | Set the default value of the home directory field in /etc/passwd. |
| -e | Set the default value of the expire field in /etc/shadow. |
| -f | Set the default value of the inactive field in /etc/shadow. |
| -g | Set the default value of the GID field in /etc/passwd.
* If "CREATE_HOME" in /etc/login.defs is "no", this value is used.
|
| -s | Set the default value of the shell field in /etc/passwd. |
| Check environment | |||
| O S | Ubuntu 15.10 (64bit) | CPU | Intel i7-4710MQ 2.50GHz |
| SHELL | GNU bash (4.3.42) | RAM | 1 GB |