[TUHS] Dash options

[charles.unix.pro@gmail.com (Charles Anthony)]

On Tue, Nov 28, 2017 at 5:23 PM, Doug McIlroy <doug at cs.dartmouth.edu> wrote:

> Early on, when multics was understood to have
> one big, segemented address space, it was expected
> that PL/I name qualification ($) would serve to address
> segments. I do not know whether that idea was
> actually implemented.
>
>
If I understand you correctly, approximately yes.

Entry points are usually defined as "foo$bar", where "foo" is the segment
name, and "bar" an entry point in the segment symbol table. I believe that
the degerate case of "foo$" is treated as "foo$foo" by the shell.

In the following example, the segment name is "hello", the entry point
"world".


*edm hello.pl1*
Segment not found.
Input.
*world: procedure options(main);*
*  dcl sysprint file output print stream;*
*  put list ("Multics rulez; UNIX droolz");*
*  put skip;*
*end world;*
*.*
Edit.
*w*
*q*
r 16:45 0.050 3

*pl1 hello*
PL/1 33e

r 16:45 0.128 36

*hello$world*
Multics rulez; UNIX droolz
r 16:45 0.033 23


-- Charles
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