Goto http://testing.preware.org/ and follow the instructions/direction. When directed to run a linux command, you MAY come here and follow these steps.
Task 1) Download webOSQuickInstall from WOSQI Download
Task 2) Connect your webOS device to your computer (Developer Mode MUST be ON)
Task 3) Open webOS Quick Install
Task 4) Click Tools and select Linux CommandLine
Task 5) Copy and Past OR type in the linux command(s) you want to run
Task 6) Hit return or press Enter to execute/run the command.
Go back to http://testing.preware.org/