On 2021-02-09 19:02:12 Michael Lueck wrote:
> > Any ideas on how this was meant to be when it was designed?
>
> I never claim to be the best expert at REXX history, however...
>
> On Mainframe, I believe either the Stream concept came much later or still
> is not there at all.
The file I/O functions [stream(), charin(), charout(), chars(),
linein(), lineout(),
lines()] have been in the language since at least when I first used VM/CMS in
~1974.
They could operate on CMS minidisk, Shared File System*, or Byte File System*
files;
sockets capabilities came later when a TCP/IP stack was added to VM. In MVS
Rexx could
use these functions to do I/O to QSAM, Open Edition or Unix System Services
files.
See https://www.vm.ibm.com/library/640pdfs/64622201.pdf Chapter 9:
Input and Output, for
example.
Leslie
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