System commands

APLX supports a range of commands ('system commands') which are used to communicate directly with the system. They are not part of the APL language itself. APL system commands start with a right parenthesis:

             )SAVE

The display generated by a system command cannot directly be used as the argument to a function. However, in APLX, system commands can be executed using the ⍎ (execute) primitive:

             ∇LIB
      [1] ⍝ Show contents of library 0
      [2] ⍎')LIB'
      [3] ∇

The output from executed system commands can be captured in a variable or passed as an argument to a function:

            X←⍎')SYMBOLS'
            X
      IS 1026, USED 21

See the reference section on System Commands for a full list of available commands.