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

On Wed, May 25, 2016 at 8:24 AM, Julian H. Stacey <[email protected]> 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.
>
> There'll be other more efficient solutions  ;-)

Good questions. I did not clearly define. I apologize for lacking of
clarity. I really used the word efficient just to mean "I hope it
takes not longer than one second considering I have a huge (1GB) mbox
file."

Kind regards,

Xu