ksh or bash

I want to create a script to add new rules into iptables file on maybe 100 servers. What would be the best way in ksh or bash to do this. If I grep on a certain parameter and then when I find that not sure how to echo"new line 1...."' echo "new line 2" after the matching parameter.
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liddlerConnect With a Mentor Commented:
I think you need to use sed

for example if you need to text "new line 1" after "parameter1"
you would do:
sed '/parameter1/a new line1' iptable_file >iptable_file.new
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