Re: proposal: alternative psql commands quit and exit

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Daniel Verite <daniel(at)manitou-mail(dot)org>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Everaldo Canuto <everaldo(dot)canuto(at)gmail(dot)com>, Chapman Flack <chap(at)anastigmatix(dot)net>, Vik Fearing <vik(dot)fearing(at)2ndquadrant(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: proposal: alternative psql commands quit and exit
Date: 2018-02-01 13:38:57
Message-ID: 20180201133857.GD20358@momjian.us
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On Thu, Feb 1, 2018 at 12:01:37PM +0100, Daniel Verite wrote:
> Also, the fact that Control-D can quit in the middle of a
> multiline query without any confirmation is a usability problem, because
> you can always fat-finger a Ctrl+key. By comparison, bash doesn't
> accept it and emits the same error as if a script was improperly
> terminated. Example:
>
> $ cat '
> > [Hit Ctrl+D here] bash: unexpected EOF while looking for matching `''
> bash: syntax error: unexpected end of file
> $

I just researched this. In bash, it seems Ctrl+C and Ctrl+D do kind of
the same thing, i.e. exit command:

$ echo '
> bash: unexpected EOF while looking for matching `''
bash: syntax error: unexpected end of file
$ echo '
> ^C
$

so the question is whether it is wise that we have ^C and ^D do
different things on psql, or they should do the same thing. I doubt we
would want to change ^D, so it would be changing ^C to exit, except we
use ^C to cancel a query and return you to a prompt, so I don't see how
we can change that either.

In summary, we are probably can't improve this.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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