When starting LabPlot from the command prompt, you can supply the name of a project file:
LabPlot [file.lpl
...]
The following command line help options are available
--help
This lists the most basic options available at the command line.
--help-qt
This lists the options available for changing the way LabPlot interacts with Qt™.
--help-kde
This lists the options available for changing the way LabPlot interacts with KDE.
--help-all
This lists all of the command line options.
--no-splash
do not show the splash screen
--author
Lists LabPlot's author in the terminal window
--version
Lists version information for Qt™, KDE, and LabPlot.
Also available through LabPlot -v