[Info-vax] Still no DIR/SORT_BY_TIME

[Simon Clubley]

On 2015-08-16, Johnny Billquist <bqt at softjar.se> wrote:
> On 2015-08-16 20:05, Simon Clubley wrote:
>>
>> RSTS/E DCL did this as well and you could still use PIP directly
>> if you needed to (/mode:4096 for example).
>
> Well, unless I remember wrong, it was/is not done the same way. Under 
> RSTS/E, DCL would probably invoke PIP, with the command line massaged to 
> accomplish the task.
> Under RSX, the command line is rewritten by the DCL CLI, and then passed 
> to MCR to actually parse and execute it. So DCL do not invoke any 
> programs, except MCR. And you can turn on debugging in DCL, which cause 
> the command line DCL generates to be printed, but not executed. That way 
> you can see what MCR line it translates to.
>
> Example:
> $ set debug
>
> $ dir /since:1-jan-2001
> PIP /DD:1-JAN-2001:*&/LI
> $
>
>> BTW, does RSX also have a read regardless mode ?
>
> Not sure what you mean by that. Maybe you can explain in more detail 
> what you're asking, and then I can answer. :-)
>

With RSTS/E, when opening a file, you could specify various options
using a mode field which was a bitfield encoded integer. Opening a file
with mode 4096 allowed you to open and read a file when you normally be
blocked due to an incompatible open mode from another currently running
program.

It's been a _long_ time since I last used it, but I think (IIRC) it
could even be used to see the current contents of a file which was
exclusively opened for writing by another program. (Assuming you had
suitable access rights to the file of course.)

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
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