On TRON, a unix based machine, the command line would be like:

  prog_name  -o <output-file> -u 

  and other options. Text input would be read from standard input and

  text output would be written to standard output.

  e.g.  GET_LINE( LINE, LINE_LENGTH);

        PUT_LINE( LINE(1..LINE_LENGTH);

  Digital provides the package MAIN_PROGRAM_ARGUMENT_LIST that is

  demonstrated below:

  -- test argument passing from command line into Ada on Ultrix DEC Ada

  with main_program_argument_list;
  with text_io;
  procedure test_argv is
    package mpal renames main_program_argument_list; -- just shorten name
  begin
    for i in 0..mpal.argc-1 loop
      text_io.put_line(mpal.get_arg(i)); -- get_arg(i) equiv  argv[i]
      text_io.put_line("length="&integer'image(mpal.get_arg(i)'length));
              -- this shows the ascii.nul has been removed for Ada
    end loop;
  end test_argv;


  It is up to the program to interpret the command line input.