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Grep a string in a range and delete the line

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# 1  
Old 07-24-2009
Grep a string in a range and delete the line
Hi,

i need to delete a lines after searching a particular string but this searching should only happen after the 4th line..

basically imagine a file like this

From: abcd.yahoo.com
To: cdeb.yahoo.com
Subject: hi all
sdfsd
sadasd
asdasd
dfsdf
From: abcd.yahoo.com
To: cdeb.yahoo.com
Subject: hi all
asdfasdf
asdfasdf
dsghsdfg
hjhdfg

and i need the ouput like this

From: abcd.yahoo.com
To: cdeb.yahoo.com
Subject: hi all
sdfsd
sadasd
asdasd
dfsdf
asdfasdf
asdfasdf
dsghsdfg
hjhdfg

how do i do this either grep or sed or awk.. please help..
# 2  
Old 07-24-2009
try..
Code:
-bash-3.2$ sed '8,10d' file
From: abcd.yahoo.com
To: cdeb.yahoo.com
Subject: hi all
sdfsd
sadasd
asdasd
dfsdf
asdfasdf
asdfasdf
dsghsdfg
hjhdfg
-bash-3.2$

# 3  
Old 07-24-2009
The following command removes header lines (From, To, Subject) after the 4th line :
Code:
awk 'NR>4 && /^(From|To|Subject):/ {next} 1' inputfile

Inputfile:
Code:
From: abcd.yahoo.com
To: cdeb.yahoo.com
Subject: hi all
1-sdfsd
1-sadasd
1-asdasd
1-dfsdf 
From: abcd.yahoo.com
To: cdeb.yahoo.com
Subject: hi all
2-asdfasdf
2-asdfasdf
2-dsghsdfg
2-hjhdfg

Output:
Code:
From: abcd.yahoo.com
To: cdeb.yahoo.com
Subject: hi all
1-sdfsd
1-sadasd
1-asdasd
1-dfsdf 
2-asdfasdf
2-asdfasdf
2-dsghsdfg
2-hjhdfg

Jean-Pierre.
# 4  
Old 07-27-2009
Code:
sed '4,${
	/From/{
	N
	N
	d
	}
}'

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