[Gllug] Excluding matches with grep

[Dylan]

On Sunday 25 January 2004 18:42 pm, Jack Bertram wrote:
> * Dylan <dylan at dylan.me.uk> [040125 18:35]:
> > Hi all,
> >
> > I'm trying to filter some entries from a logfile to a text file.
> > Specifically, I want all firewall entries, except those which I can
> > already explain. For example - I don't want martian packets. So,
> > issuing:
> >
> > cat /var/log/gateway.messages | grep SuSE-FW > fw.txt
> >
> > gets all the firewall messages, then I can re-grep to extract
> > particular things by other patterns, but ideally I'd like to be
> > able to do:
> >
> > cat /var/log/gateway.messages | grep {reg-exp to match all lines
> > with SuSE-FW except (those with martian OR SPT=53 OR ...)} > fw.txt
> >
> > Is this possible with grep?
>
> cat /var/log/gateway.messages | grep 'SuSE-FW' | grep -Ev
> '(martian)|(SPT=53)' > fw.txt

Thank you - that does it!

Dylan

>
> ?
>
> jack

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