-minimized keep startup bitmap minimized.
-invisible no startup screen, no default document and no UI.
-quickstart starts the quickstart service
-nologo don’t show startup screen.
-nolockcheck don’t check for remote instances using the installation
-nodefault don’t start with an empty document
-headless like invisible but no userinteraction at all.
-help/-h/-? show this message and exit.
-impress create new presentation.

-p
print the specified documents on the default printer.
-pt
print the specified documents on the specified printer.
-view
open the specified documents in viewer-(readonly-)mode.
-show
open the specified presentation and start it immediately
-accept=
Specify an UNO connect-string to create an UNO acceptor through which
other programs can connect to access the API
-unaccept=
Close an acceptor that was created with -accept=
Use -unnaccept=all to close all open acceptors
Remaining arguments will be treated as filenames or URLs of documents to open.

$ soffice -nologo -show sample.sxi