gfwlist/lookup.sh

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#!/bin/bash
if [ $# != 1 ]; then
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echo -e "\
Usage:
$./lookup.sh wordpress
$./lookup.sh ghs.l.google
$./lookup.sh 72.14.203.121 // ghs
$./lookup.sh 67.207.139.81 // Posterous
$./lookup.sh 72.32.231.8 // Tumblr
$./lookup.sh typepad
";
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exit 1;
fi
while read line
do
host=$( echo "$line" |
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grep -oE "[a-z0-9]([a-z0-9_\.\-]*[a-z0-9])?\.[a-z]{2,4}" |
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grep -vE "(aspx?|dotn|exe|fan|html?|php|zh)$"
);
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[ "$host" ] && [ "$(nslookup $host | grep -i $1)" ] && echo $host;
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done < "list.txt"