useradd
From NetBSD Wiki
useradd(8) creates a new user account. After you add the user to the system, you normally use passwd to set a password for the user, else the user cannot log in.
# useradd -G wheel -m susan # passwd susan
To create a home directory for the user while adding it, you specify the -m option when you run useradd. This will create the home directory, correctly set its permissions, and copy the skeleton files from /etc/skel.
Each user belongs to one primary group and to zero or more secondary groups. By default, useradd sets the primary group of the new user to users (unless you change the default). You can add secondary groups with the -G option. A common use is -G wheel to allow the new user to run su. The option -G wheel,wsrc would add the user to both the wheel and wsrc groups.
