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From: Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups: comp.unix.shell
Subject: Re: [ksh] Show command number in shell prompt
Date: Tue, 24 Sep 2024 15:23:56 +0200
Organization: A noiseless patient Spider
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On 24.09.2024 14:59, hymie! wrote:
> In our last episode, the evil Dr. Lacto had captured our hero,
>   Janis Papanagnou <janis_papanagnou+ng@hotmail.com>, who said:
>> Not long ago I added an '!' (exclamation mark) to my prompt to have
>> it get expanded to the command number [in Kornshell];  PS1='(!)$ '
>> The effect is that a new shell instance starts with the number 1000
>> which incidentally equals the HISTSIZE. - Any ideas what could have
>> gone wrong here?
> 
> Nothing has gone wrong.
> 
> HISTSIZE=1000 means that the maximum size of your history is 1000.  Once it
> hits that level, the oldest entries are dropped, and the newest entries
> are added to the end.
> 
> So every command you issue is always the last command in the history.
> Since the history is full, it's always command number 1000.

Hmm.. - that explains, maybe, part of it. Thanks.

I'm still irritated; if I see in one shell session a value of 11059
(which is an indication that the numbers created by '!' don't wrap)
I'm astonished that the counting in a new window will start at 1000
(and not at 1 or at the maximum previous value).

I've just closed a window with an actual maximum command number of
1643, and "restoring"[*] that window will continue at 1643.

Still puzzling...

Janis

[*] Note: Closing a shell window and re-opening it anew will work
on the previous, same history file.