Which command is used to list all user accounts on a Linux system?

The command that is used to list all user accounts on a Linux system is cat /etc/passwd. This command accesses the /etc/passwd file, which contains essential information about users on the system. Each line in this file represents a different user account with various fields that include the username, user ID (UID), group ID (GID), home directory, and default shell. By using cat, the content of the file is displayed, allowing you to see all the user accounts currently available on the system.

Other commands mentioned do not exist or are not standard commands in Linux systems for listing users. For instance, showusers, listusers, and users -a are not recognized as valid commands in a typical Linux distribution. Understanding how user accounts are structured in the /etc/passwd file is fundamental for managing users and performing administrative tasks on a Linux system.