Remove duplicate history entries in command buffer

[Kornel Benko]

Am Mon, 11 Jul 2022 10:53:23 +0200
schrieb Kornel Benko <kornel at lyx.org>:

> Am Mon, 11 Jul 2022 00:15:40 +0200
> schrieb Jean-Marc Lasgouttes <lasgouttes.lyx.org at free.fr>:
> 
> > Le 10/07/2022 à 22:05, Kornel Benko a écrit :  
> > > So I was not clear enough. With 'duplicated' I meant anywhere in the history.
> > > 
> > > The (my) argument was seeing the session file full of the same commands
> > > spread all over the file, essentially shortening the maximum (different) commands
> > > possible.
> > > 
> > > I was testing findadv, the session file was full of 'regex-mode', 'unicode-insert,
> > > etc.    
> > 
> > Does this cause actual issue, or is it just 'untidy'?  
> 
> Asking this way I'd say 'actual issue'.
> Searching for some entry (which you know have used) can be long, even if not using many
> different commands.
> 
> > Repeated commands at the end are a pain, I agree with that. But further 
> > in past, they are a memory of useful command sequences.
> > 
> > JMarc  
> 
> Good point. OTOH repeated sequences would accumulate too in this case.
> 
> So the outcome may be a new preference?
> 
> 	Kornel

Maybe the preference in tcsh describes our different views.
(I am using tcsh, you bash)
Here the excerpt from tcsh(1)
       histdup (+)
               Controls  handling  of  duplicate entries in the history list.  If set to
	`all' only unique history events are entered in the history list.  If set  to
	`prev' and  the last  history  event is the same as the current command, then the
	current command is not entered in the history.  If set to `erase' and the same
	event is  found in  the history  list,  that  old event gets erased and the
	current one gets inserted. Note that the `prev' and `all' options renumber
	history events so there are no gaps.

(I am setting
	set histdup=erase
in .cshrc)
The behaviour like in bash would be set with 'set histdup=prev')

	Kornel
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