User accounts are created using admintool or the useradd commands. Account information is stored in the /etc/passwd file. The /etc/shadow file is used to store user account passwords.
Groups are created using admintool or the groupadd commands. Group information and passwords are stored in the /etc/group file.
Initialization files are associated with each type of shell (Bourne, C, and Korn). These initialization files can be used to set up the environment before the user has access to the system, when each shell is created, or when the user exits the system. Initialization file templates are available in /etc/skel to provide a starting point for creating custom initialization files. The system profile (/etc/profile) is executed before any user account initialization files.