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sed: find match and delete the line above

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# 1  
Old 02-01-2006
sed: find match and delete the line above
I am searching a dhcpd.conf to find the hardware ethernet match, then once the match is found delete just the line above it. For example:

testmachine.example {
hardware ethernet 00:00:00:00:00:00;
fixed address 192.168.1.100;
next-server 192.168.1.101;
filename "linux-install/pxelinux.0";
}

I would like to use sed to remove "testmachine.example {".
I was going to create a two step process by removing the line above the harware ethernet match. Then remove the hardware ethernet match through }. However, if someone knows how to find the harware ethernet match and remove the whole block, I would be very appreciative.

There are multiple fixed addresses in this file, so it can only remove this block based on the hardware ethernet match.
# 2  
Old 02-01-2006
Hmm... this should do it
Code:
sed '/^.* {/ {:a /}/ !{N;ba} }; s/.*00:00:00:00:00:00.*//' dhcpd.conf

Cheers
ZB
# 3  
Old 02-01-2006
Thank you, zazzybob. It worked exactly like I wanted it to.
# 4  
Old 07-02-2008
Error
Quote:
Originally Posted by zazzybob
Hmm... this should do it
Code:
sed '/^.* {/ {:a /}/ !{N;ba} }; s/.*00:00:00:00:00:00.*//' dhcpd.conf

Cheers
ZB
I Get "Label too long: " error ...any idea? This was on SOlaris machine...
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