Introduction

System commands are not executable APL expressions. They provide services or information associated with the workspace and the external environment.

Command Presentation

System commands may be entered from immediate execution mode or in response to the prompt ⎕: within evaluated input.  All system commands begin with the symbol ), known as a right parenthesis.  All system commands may be entered in upper or lower case.

The output of a system command appears in the Session log interactively, or on the stderr stream when the interpreter is attached to operating-system streams.