[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Meaning behind Control-G

From: Lars Brinkhoff
Subject: Meaning behind Control-G
Date: Mon, 01 Jun 2020 07:29:02 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

> > > > What does C-g mean? Why the sequence C-g specifically? I think
> > > > the disconnect may be that C-g appears outwardly meaningless.
> > > I will ask Greenblatt -- he might remember.
> > I suspect there is no deep meaning behind it, the BEL was common way
> > back then to mean abort, or alert.  TECO and DDT both used C-g for
> > abort,
> Are you confident of that?  I don't remember, but if your memory is
> clear, that is probably the reason.

I remember it clearly, because I use ITS DDT almost daily.  TECO, not so
much but it's easy enough to verify.

Now, why TECO uses Control-G for "quit", I don't know.  ASCII "BEL" as
an "alarm" is a plausible theory, but hard to verify.  In general
there's no strong link between control characteras as inputs and their
corresponding output behaviour.

I see no control character commands here, so maybe Control-G wasn't
in use with PDP-1 TECO:

I don't see Control-G Here either, so maybe it was added after 1964:

reply via email to

[Prev in Thread] Current Thread [Next in Thread]