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Summary

  • The user account types in Linux are the superuser, system users, and regular users.

  • A user has a primary group and might be a member of supplementary groups.

  • The /etc/passwd, /etc/group, and /etc/shadow critical files contain user and group information.

  • You can run commands as the superuser with the su and sudo commands.

  • The useradd, usermod, and userdel commands manage users.

  • The groupadd, groupmod, and groupdel commands manage groups.

  • The passwd command manages passwords for users.

  • The chage command displays and configures password expiration settings for users.

Revision: rh199-9.0-4fecb06