AIX - User administration related files

The following files are referenced while doing user administration:

1. /etc/security/environ Contains the environment attributes for users.
2. /etc/security/lastlog Contains the last login attributes for users.
3. /etc/security/limits Contains process resource limits for users.
4. /etc/security/user Contains extended attributes for users.
5. /usr/lib/security/mkuser.default Contains the default attributes for new users.
6. /usr/lib/security/mkuser.sys Customizes new user accounts.
7. /etc/passwd Contains the basic attributes of users.
8. /etc/security/passwd Contains password information.
9. /etc/security/login.cfg Contains configuration information for login and user authentication.
10. /etc/utmp Contains the record of users logged into the system.
11. /var/adm/wtmp Contains connect time accounting records.
12. /etc/security/failedlogin Records all failed login attempts.
13. /etc/motd Contains the message to be displayed every time a user logs in to the system.
14. /etc/environment Specifies the basic environment for all processes.
15. /etc/profile Specifies additional environment settings for all users.
16. $HOME/.profile Specifies environment settings for specific user needs.
17. /etc/group Contains the basic attributes of groups.
18. /etc/security/group Contains the extended attributes of groups.

References:

1. AIX 5L Administration
2. AIX for UNIX Professionals
3. Accelerating AIX: Performance Tuning for Programmers and Systems Administrators