systemd-sysusers

Create system users and groups. If the config file is not specified, files in the sysusers.d directories are used. More information: https://www.freedesktop.org/software/systemd/man/systemd-sysusers.html.

systemd-sysusers path/to/file

systemd-sysusers --dry-run path/to/file

systemd-sysusers --cat-config