PostScript and Ghostscript
So UNIX is lacking a common ground for printing on paper and displaying on screen. Despite this unfavorable
legacy for UNIX, basic printing is fairly easy if you have PostScript printers at your disposal. The reason is
that these devices have a built-in PostScript language “interpreter,” also called a raster image
processor (RIP), (which makes them more expensive than other types of printers; throw PostScript toward them,
and they will spit out your printed pages. The RIP does all the hard work of converting the PostScript drawing
commands into a bitmap picture as you see it on paper, in a resolution as done by your printer. This is no
different than PostScript printing a file from a Windows origin.