When starting LabPlot from the command prompt, you can supply the names of a project file:
LabPlot [file.lpl...]
The following command line help options are available
This lists the most basic options available at the command line.
This lists the options available for changing the way LabPlot interacts with Qt.
This lists the options available for changing the way LabPlot interacts with KDE.
This lists all of the command line options.
Lists LabPlot's author in the terminal window
Lists version information for Qt, KDE, and LabPlot. Also available through LabPlot -v