Second you HAVE to have a command processor, otherwise you can't execute commands!
Are you calling the command prompt of Winblows a command processor? Or are you calling the "click on stuff" style of Mac and Windows a command processor?
I wouldn't dignify either with such a label. They are interfaces to programs, and I still gag on the time I first tried to write a Windows program, but it's a stretch to call the Windows or Mac API a command processor.