[Info-vax] DCL, was: Re: Microkernel (was: VMS port to x86)

[Paul Sture]

On Fri, 10 Aug 2012 12:18:17 +0000, Simon Clubley wrote:

> On 2012-08-09, Paul Sture <paul at sture.ch> wrote:
>> On Thu, 07 Jun 2012 17:19:46 +0000, Simon Clubley wrote:
>>
>>> On 2012-06-07, Paul Sture <paul.nospam at sture.ch> wrote:
>>>> On Tue, 05 Jun 2012 18:49:39 +0000, Simon Clubley wrote:
>>>>> 
>>>>> Optionally writing out the commands entered in the current session
>>>>> to the end of a existing history file when you logout and having
>>>>> those commands automatically available for you at next login as part
>>>>> of the command history. (I am thinking .bash_history here).
>>>>
>>>> I have a bit of DCL which I implemented before RECALL got the ability
>>>> to write its history to file.  I'll dig it out later.
>>>>
>>> The main problem here is identifying the commands entered during the
>>> current session from the commands from previous sessions which were
>>> loaded into the recall buffer at the start of the session.
>>> 
>>> If you have some DCL to do this, I would be interested to see how you
>>> did it, thanks.
>>
>> Sorry for the delay but here it is.  Contrary to what I said above, it
>> does rely on being able to write the recall buffer.  Its advantage over
>> the RECALL command is that you can search for keywords anywhere in the
>> buffer rather than at the start of lines
>>
>>
> Thanks Paul.
> 
> What I was looking for was a way to be able to extract automatically
> only the commands entered into the recall buffer from the current
> session.

I have to admit that when I wrote my original message I had forgotten 
exactly what my bit of DCL did. :-)

> I would then be able to append them to a combined history log and drop
> the older commands once it got over a predefined size.
> 
> This functionality be built into bash and it's something which it would
> be nice for DCL to have as well.

Yes.

> (Before anyone suggests it, you cannot just dump the whole recall buffer
> to a file; think about the sequence of events when you have multiple DCL
> sessions going at the same time (with their unique commands entered
> during the course of that session), and what will happen when you exit
> the sessions one by one.)

I am sure it could be done in DCL, but doing it without creating a 
monster would require careful thought.

-- 
Paul Sture