/usr/bin/systemd-sysusers

> systemd-sysusers [OPTION…] [CONFIGURATION FILE…]

Create system user and group accounts.

Commands:
     --cat-config          Show configuration files
     --tldr                Show non-comment parts of configuration
  -h --help                Show this help
     --version             Show package version

Options:
     --root=PATH           Operate on an alternate filesystem root
     --image=PATH          Operate on disk image as filesystem root
     --image-policy=POLICY Specify disk image dissection policy
     --replace=PATH        Treat arguments as replacement for PATH
  -n --dry-run             Just print what would be done
     --inline              Treat arguments as configuration lines
     --no-pager            Do not start a pager

See the systemd-sysusers.service(8) man page for details.