There is an application, comes with Mac OS X, called Preview that
interprets postscript code. With it, you can open a text file containing code like this:
%!PS
/fontSize 12 def
/charRow 16 string def % BUFFER
/Symbol fontSize selectfont
20 770 translate
0 0 moveto
0 1 15 {
/y exch 16 mul def
0 1 15 {
charRow exch dup y add put
} for
gsave charRow show grestore
0 fontSize neg rmoveto
} for
showpage
and Preview will automatically interpret the code and give you the image.
The above code generates a page showing all the Symbol font characters:
The Preview application is an interpreter, albeit not a full-featured interpreter like Distiller, but it’s very useful for running simple postscript programs.
Learn Postscript 