Ox

From the man page

"OX is an interpreter program for AL (Animation Language) in the pegasys system. It's an extension to a small Scheme interpreter called Siod."

An interpreter is a program that allows you to type in "expressions" on a command line, which it will then "evaluate".
Expressions are programs that return some value when executed.
"Evaluating an expression" means computing the value it returns.

Using Ox

Ox is invoked from the unix prompt by typing "ox".

   abulafia:mlewis> ox
   Welcome to OX, version 2.22 Beta [8/26/94]
   ox -->

At the command-line prompt, the user can then type a command (called an expression) and ox will immediately evaluate it.

   ox --> (print "hello world")
   "hello world"
   ()
   ox -->

We told ox to print a string, so it did... immediately. It then returned to the prompt, and awaits our next command. The "()" will be discussed later.

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mrl