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Re: ctrl-C and command lists


From: Chet Ramey
Subject: Re: ctrl-C and command lists
Date: Mon, 22 Sep 2008 17:36:06 -0400
User-agent: Thunderbird 2.0.0.16 (Macintosh/20080707)

Julian Bradfield wrote:
> In every other shell I've used, the behaviour of ctrl-C in an
> interactive shell is to interrupt the current command-line and return
> to the shell prompt.
> This is, I think, the behaviour expected by the user in almost all
> circumstances. In the rare circumstance when one doesn't want to do
> that, traps can be used.
> 
> Historically, bash has taken the approach that ctrl-C interrupts the
> currently executing pipeline, but that's all. That results in the mad
> panic when one does:
> 
> for f in * ; do destroy $f ; sleep 1; done
> oh-shit-ctrl-C-ctrl-C-ctrl-C-oh-shit-ctrl-Z-I-hate-bash!
> 
> I see that the most recent bash has now changed its behaviour so
> that ctrl-c breaks out of any executing loops, thereby solving the
> above problem.
> 
> However, as pointed out recently by "jidanni" in RISKS 25.31, bash
> still executes the rest of a list:
> 
> sleep 360000 ; launch_shuttle
>  oops, found a problem with the O-rings, ctrl-C
> VROOM!
> 
> 
> I argue that bash should do what the user expects: in the absence of
> traps, SIGINT should return to the prompt.

I will make this change for the next version.  Keep in mind that it's a
problem because of the way job control works -- unless other arrangements
are made, bash doesn't get the SIGINT sent to the foreground process
group.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer

Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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