Shell Programming and Scripting

I have in iptables file the following:


-A RUN -p tcp -m tcp -s ipaddress1 --dport xxx --syn -j ACCEPT
-A RUN -p tcp -m tcp -s ipaddress2 --dport xxx --syn -j ACCEPT

And I want to add for each ipaddress1 and ipaddress2 another IP address
Like this:

-A RUN -p tcp -m tcp -s ipaddress1 --dport xxx --syn -j ACCEPT
-A RUN -p tcp -m tcp -s ipaddress2 --dport xxx --syn -j ACCEPT
-A RUN -p tcp -m tcp -s ipaddress3 --dport xxx --syn -j ACCEPT

Because I have multiple services and definitions I have to search for ipaddress1 and ipaddress2 to add the third IP.

I try to do with sed but no success.

Thanks.

Code:

awk '{print } /ipaddress2/ { print "-A RUN -p tcp -m tcp -s ipaddress3 --dport xxx --syn -j ACCEPT" }' inputfile > outputfile

It's SOLVED!!!
I have recieved some help with this.
In the begining I have to find 2 IP's but in the end only 1 match helps.

Here's the code

#!/bin/bash
awk 'BEGIN{ FS=" "}
{
value=0
for (i = 1; i <= NF; i = i + 1){
if ( $i ~ /IPADDRESS1/ ){
printf( "%s ", "IPADDRESS3" );
value=1;
}
else {
if ( $i == "COMMIT" ) {
printf( "%s", $i );

}
else {
printf( "%s ", $i );
}
}
} printf( "\n" );
if ( value == 1 ) {
printf ( "%s\n", $0 );
value=0;
}

}' /etc/sysconfig/iptables

I have to add the commit if because if you leave a blank space after COMMIT iptables gives you a sintax error.

Thanks for you reply.