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Re: History not saved when closing terminal while bash is sourcing a scr


From: Chet Ramey
Subject: Re: History not saved when closing terminal while bash is sourcing a script
Date: Thu, 8 Aug 2019 08:35:25 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 8/8/19 4:13 AM, Tomas Janousek wrote:
> Hi,
> 
> On Sun, Aug 04, 2019 at 01:42:12PM -0400, Chet Ramey wrote:
>> On 8/3/19 11:05 AM, Tomas Janousek wrote:
>> I don't have or use tmux, but I'm going to guess that `kill-window' sends
>> a SIGHUP to the process group and follows it up with a SIGKILL. The
>> `source' turns off saving to history -- the `source' gets saved in the
>> history list, not the commands it runs -- and is still running when the
>> SIGHUP arrives. The SIGHUP causes the shell to exit without saving the
>> history because history is turned off when the signal handler runs.
> 
> So this means `source' shouldn't ever be used in interactive shells if one
> cares about their shell history, right? 

Or, alternately, one could exit the shell by some means other than sending
it a fatal signal and taking your chances.

I'll file an issue in the Midnight
> Commander bug tracker to use a shell function instead. It might be worth
> documenting the behaviour, though, as it is quite suprising -- shell functions
> don't need to turn off saving to history, so why should `source'?

Because they are parsed and executed separately. Functions are parsed at
definition time and executed when invoked; source scripts are parsed and
executed on the fly a command at a time.

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



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