Re: Extract last email from an email file (mbox format)

On 25/05/16 15:24, Julian H. Stacey wrote:
> Hi, Reference:
>> From:		"Ruud H.G. van Tol" <[email protected]>
>> Date:		Wed, 25 May 2016 09:38:44 +0200
> "Ruud H.G. van Tol" wrote:
>> On 2016-05-25 08:12, Xu Wang wrote:
>>
>>> Hi how can I efficiently extract the last email in a huge mbox email file?
>> If you need this more than once, I would switch to maildir first.
> It was Xu's word "efficiently" that put me off replying earlier:
> - efficient in reducing cpu processor time ? Or run time ?
> - efficient in minimising transient max disc used ? Or
> - efficient in human time ?
>     not searching new tools or reading manuals if for a one off job
>     & a solution already known, even if cludgy ?
>
> I'd cludge it with my
> 	http://berklix.com/~jhs/src/bsd/jhs/bin/public/mailsplit/
> & if the mbox was truly monstrous & I was about to run out of space, either:
> - first dd toward the end of mega mbox.
> - or periodically delete numerous output files, either:
>    - by suspending job
>    - or using another xterm in same dir.

What I do for splitting:
1)  cat  little.rc
:0
mydir/


2)  formail -s procmail  ./little.rc  < theBigBox

But, maybe your program is faster?

--udi


>
> There'll be other more efficient solutions  ;-)
>
> Cheers,
> Julian
> --
> Julian Stacey, BSD Linux Unix Sys Eng Consultant Munich http://berklix.eu/jhs/
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