saving a screenshot from command line

Hi,

I need to write some documentation of imaging a PC in SCCM. AS it boots to the SCCM environment, I don't have access to MS Paint etc within there to be able to save screenshot in the conventional way.

Is it possible to take a screenshot and save it to USB using a command line function?

E.g I press PrintScrn then open cmd and use a cmd function to save it to USB.

thanks.