From: Tom Lane <tgl@sss.pgh.pa.us>
To: Kevin Wang <kevinpgcloud@gmail.com>
cc: pgsql-hackers@postgresql.org
Subject: Re: A tiny improvement of psql
In-reply-to: <CAAZWVYpquc=nHUAnmSS62SYS0wQe8SNNr_X6H-=ba9i5BWJOjA@mail.gmail.com>
References: <CAAZWVYpquc=nHUAnmSS62SYS0wQe8SNNr_X6H-=ba9i5BWJOjA@mail.gmail.com>
Comments: In-reply-to Kevin Wang <kevinpgcloud@gmail.com>
	message dated "Sun, 24 Dec 2023 13:17:38 -0500"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <2036812.1703608601.1@sss.pgh.pa.us>
Date: Tue, 26 Dec 2023 11:36:41 -0500
Message-ID: <2036813.1703608601@sss.pgh.pa.us>
Archived-At: <https://www.postgresql.org/message-id/2036813.1703608601%40sss.pgh.pa.us>
Precedence: bulk

Kevin Wang <kevinpgcloud@gmail.com> writes:
> As you know, we can use the UP arrow key to get the previous command to
> avoid extra typing. This is a wonderful feature to save the lives of every
> DBA. However, if I type the commands like this sequence: A, B, B, B, B, B,
> B,  as you can see, B is the last command I execute.

> But if I try to get command A, I have to press the UP key 7 times.  I think
> the best way is: when you press the UP key, plsql should show the command
> that is different from the previous command, so the recall sequence should
> be B -> A, not B -> B -> ... -> A.  Then I only press the UP key 2 times to
> get command A.

This is driven by libreadline, not anything we control.  I have
seen the behavior you describe in some other programs, so I wonder
whether it's configurable.

> Another requirement is: could we use / to repeat executing the last command
> in plsql just like sqlplus in Oracle?

I'm pretty certain you can configure this for yourself with readline.

			regards, tom lane