Last login: Fri Sep 22 19:41:13 on ttys000
Workstation:~ Fangio$ /Volumes/Seagate\ 4TB/OS\ X\ Installer/macOS\ 10.13\ High\ Sierra/Dev\ Betas\ \&\ GM\ Candidates/macOS\ 10.13\ GM1\ Build\ 17A362a/Install\ macOS\ High\ Sierra\ Beta.app/Contents/Resources/startosinstall --usage
Usage: startosinstall --volume <target volume path>
Arguments
--applicationpath, a path to copy of the OS installer application to start the install with.
--license, prints the user license agreement only.
--agreetolicense, agree to license the license you printed with --license.
--rebootdelay, how long to delay the reboot at the end of preparing. This delay is in seconds and has a maximum of 300 (5 minutes).
--pidtosignal, Specify a PID to which to send SIGUSR1 upon completion of the prepare phase. To bypass "rebootdelay" send SIGUSR1 back to startosinstall.
--converttoapfs, specify either YES or NO on if you wish to convert to APFS.
--installpackage, the path of a package to install after the OS installation is complete; this option can be specified multiple times.
--usage, prints this message.
--volume, path to the target volume.
Example: startosinstall --volume /Volumes/Target --converttoapfs YES (or NO)
Workstation:~ Fangio$