An ltask procedure gets its parameters from the cl via the cl interface. When running without the cl, of course, the interface is much more primitive. To run an IRAF task directly, without the cl begin by simply running the program. Such stand-alone operation is especially useful when debugging. The task will sense that it is being run without the cl and issue a prompt, see Example 4.2 .
Every IRAF task has some special commands built in.
The command bye is used to exit the interpreter, returning to the host command interpreter.