[Gllug] Excluding matches with grep

[Dylan]

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
-- 
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temporary safety, deserve neither liberty nor safety." 
                                  -Benjamin Franklin

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