systemd-sysusers

`systemd-sysusers` is a tool used in Linux systems to automate the creation and management of system user accounts and groups during system startup or package installation. Instead of manually creating accounts needed for services, `systemd-sysusers` reads configuration files that specify which users or groups are required and ensures they exist with the correct settings. This process improves security and consistency by securely managing permissions for system services. It helps keep the system organized and reduces manual setup, making system initialization more reliable and streamlined.