[CentOS] sendmail and rbl blocking - generating statistics
John Summerfield
debian at herakles.homelinux.org
Wed Mar 14 22:52:40 UTC 2007
Will McDonald wrote:
> On 14/03/07, John Summerfield <debian at herakles.homelinux.org> wrote:
>> Will McDonald wrote:
>> It might be quicker, but that doesn't make it more efficient;-)
>
> And that's why I mentioned it'd be wise to test :) I know things are
> never cut 'n dried and it depends on log makeup, datasets and whatnot.
> There's always dozens of ways to do things and no one way is perfect.
Or even best for everyone.
>
>> I often "evolve" my commandlines (I commonly use one that's 500+
>> characters long) and if I don't start with a cat I often wish I did:-/
>
> I can't think of a single instance of needing to 'cat | somethingelse'
> unless 'somethingelse' doesn't accept STDIN unless explicitly told
> to. I could obviously be missing some corner case or just be ill
> educated? :)
cat /var/log/messages | grep
is more easily changed to include another file
cat /var/log/messages{.0,} | grep
than
grep cat /var/log/messages
to
grep -h cat /var/log/messages{.0,} | grep -h
Note, I'm often typing through a modem and have to contend with
unpredictable response times.
Even worse is changing to include compressed files:
(gunzip -dc /var/log/messages.{4,3,2,1}.gz;cat /var/log/messages{.0,})\
| grep
I need to do this kind of thing fairly often.
--
Cheers
John
-- spambait
1aaaaaaa at coco.merseine.nu Z1aaaaaaa at coco.merseine.nu
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