In the SP help i'm pretty sure there is a section on command line script calls.
Also if the machine you are using does not have an 'E:\' drive mapped then it will fail i.e. if you have the projects folder on the 'C:' drive and scripts have been developed on the said drive they will hold the path to where your scripts are when calling them from command line. Something else to think about is to put your command/s into a '.bat' file
Thanks a lot...
In command line i go to the path where silk performer is installed, and give the command
performer "E:\Program Files\Borland\SilkPerformer 2006\Working\Projects\LG\TUWLEV_exported_20070424. ltp"\Automation 5\WL:Workload1
When i give this it pops an error saying wrong Command line parameter.