Additional Resources

For more information about users and groups, and tools to manage them, refer to the following resources.

Installed Documentation

Related man pages - There are a number of man pages for the various applications and configuration files involved with managing users and groups. Some of the more important man pages have been listed here:

User and Group Administrative Applications

man chage - A command to modify password aging policies and account expiration.

man gpasswd - A command to administer the /etc/group file.

man groupadd - A command to add groups.

man grpck - A command to verify the /etc/group file.
man groupdel - A command to remove groups.
man groupmod - A command to modify group membership.
man pwck - A command to verify the /etc/passwd and /etc/shadow files.
man pwconv - A tool to convert standard passwords to shadow passwords.
man pwunconv - A tool to convert shadow passwords to standard passwords.
man useradd - A command to add users.
man userdel - A command to remove users.
man usermod - A command to modify users.

Configuration Files

man 5 group - The file containing group information for the system.

man 5 passwd - The file containing user information for the system.
man 5 shadow - The file containing passwords and account expiration information for the system.