[Gllug] Excluding matches with grep

[Ian Norton]

On Sun, Jan 25, 2004 at 06:35:42PM +0000, Dylan wrote:
> 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? 
> 
> Cheers
> 
> Dylan

grep SuSE-FW /var/log/gateway.messages |grep -v martian | grep -v SPT=53 > fw.txt

Ian

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