There are several methods that are commonly used to add users to a FreeBSD system.
Using pw to add a new user
samizdata## pw useradd username -g groupname -s /bin/csh -d /home/username
The command shown above will add a new user account named "username", assign the group "groupname" as the new user's primary group, set the C shell as its default shell on login, and set its home directory as "/home/username". It will not copy any .profile or similar files from /etc/skel, create any directories, or anything else - all pw does is manipulate the system user database for you.
See also: Modifying users
Using adduser to add a new user
adduser can be run with no arguments, and will present you with a prompt for each question that needs to be answered in order to create the user that you're going to create
dave@samizdata:~% su - Password: samizdata# adduser felix Username: felix Full name: Felix Uid (Leave empty for default): Login group [felix]: Login group is felix. Invite felix into other groups? : wheel Login class [default]: Shell (sh csh tcsh tcsh bash) [sh]: bash Home directory [/home/felix]: Use password-based authentication? [yes]: Use an empty password? (yes/no) [no]: Use a random password? (yes/no) [no]: Enter password: Enter password again: Lock out the account after creation? [no]: Username : felix Password : ***** Full Name : Felix Uid : 1002 Class : Groups : felix wheel Home : /home/felix Shell : /usr/local/bin/bash Locked : no OK? (yes/no): yes adduser: INFO: Successfully added (felix) to the user database. Add another user? (yes/no): n Goodbye! samizdata#
This will create the home directory of the new user, as well as manipulate the user database and groups database in order to add the user to the appropriate groups.
See also who for info on finding out who a system thinks you are on a particular system.