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Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.1


From: Chet Ramey
Subject: Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53
Date: Wed, 29 Oct 2014 10:15:37 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 10/29/14, 1:31 AM, Graham Jones wrote:
> Since upgrading to OS X 10.10 Yosemite and thus bash 3.2.53 use of the 
> PROMPT_COMMAND='history -a; history -n'
> workaround to get a single ksh-style history causes the shell to become less 
> and less responsive until it permanently hangs.

I wasn't able to reproduce this on 10.10, but there are a lot of variables
and potential environmental dependencies here.

What would be useful is some kind of backtrace (from lldb or gdb) or a
system call trace (from dtruss or ktrace) that shows what bash is doing.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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