unable to type command into Cygwin after running 'tail'

Christopher Faylor cgf-use-the-mailinglist-please@cygwin.com
Wed Dec 8 17:29:00 GMT 2010


On Wed, Dec 08, 2010 at 04:06:35PM +0000, TJ Anthony wrote:
>Andy Koppe <andy.koppe <at> gmail.com> writes:
>
>> 
>> On 2 December 2010 20:28, Heath Kehoe wrote:
>> >> FWIW, I can't reproduce this, even if I kill the tail or less with
>> >> SIGKILL, thus giving them no chance to do any cleanup. (I assume you
>> >> use 'less -K' to allow it to be ctrl-c'ed?)
>> >>
>> >> Which shell do people who've seen the problem use? Is it an intermittent 
>issue?
>> >
>> > If you SIGKILL a 'less' while it has the tty set for raw/noecho then the tty 
>will stay in that mode.
>> 
>> Wel, yes, that was the point of trying that. The terminal settings
>> didn't get corrupted that way though, which suggests that it isn't
>> 'less' that messes things up.
>> 
>> > Also, the OP said the problem was happening on pipelines like 'tail | grep'.
>> > Neither tail nor grep muck with tty settings (that I know of)
>> 
>> Yep, a look at their sources confirms that.
>> 
>> > so if the tty is ending up with echo disabled,
>> > it's got to be the shell leaving it that way.
>> 
>> But then how did it get disabled in the first place?
>> 
>> > So again, we'll need to know which shell this is happening with
>> > and a way to reliably repro the issue to have any hope of fixing it.
>> 
>> Agreed. Also, for anyone who sees the issue again, blindly typing just
>> 'stty' (without the 'sane') and posting the output here might provide
>> a clue.
>> 
>> Andy
>> 
>> 
>
>Fresh shell:
>
>speed 38400 baud; line = 0;
>start = <undef>; stop = <undef>;
>-imaxbel
>-echoe -echok -echoctl -echoke
>
>After ctrl+C during a grep which is redirecting output to a file:
>
>$ speed 38400 baud; line = 0;
>start = <undef>; stop = <undef>; lnext = <undef>; min = 1; time = 0;
>-icrnl -imaxbel
>-icanon -echo -echoe -echok -echoctl -echoke

Can anyone duplicate this problem with a non-bash shell?

cgf

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