3.6. Additional Resources

See the following resources for more information about managing users and groups.

For information about various utilities for managing users and groups, see the following manual pages:

chage(1) — A command to modify password aging policies and account expiration.
gpasswd(1) — A command to administer the /etc/group file.
groupadd(8) — A command to add groups.
grpck(8) — A command to verify the /etc/group file.
groupdel(8) — A command to remove groups.
groupmod(8) — A command to modify group membership.
pwck(8) — A command to verify the /etc/passwd and /etc/shadow files.
pwconv(8) — A tool to convert standard passwords to shadow passwords.
pwunconv(8) — A tool to convert shadow passwords to standard passwords.
useradd(8) — A command to add users.
userdel(8) — A command to remove users.
usermod(8) — A command to modify users.

For information about related configuration files, see:

group(5) — The file containing group information for the system.
passwd(5) — The file containing user information for the system.
shadow(5) — The file containing passwords and account expiration information for the system.
login.defs(5) - The file containing shadow password suite configuration.
useradd(8) - For /etc/default/useradd, section “Changing the default values” in manual page.