New script: lookup.sh

lookup.sh

+#!/bin/bash
+
+if [ $# != 1 ]; then
+  echo -e "Usage:\n $./lookup.sh wordpress\n $./lookup.sh ghs\n";
+  exit 1;
+fi
+
+while read line
+do
+
+  host=$( echo "$line" |
+    grep -oE "[a-z0-9]([a-z0-9_\.\-]*[a-z0-9])?\.[a-z]{2,3}" |
+    grep -vE "dot$|htm$|php$" );
+
+  [ "$host" ] && [ "$(nslookup $host | grep $1)" ] && echo $host;
+
+done < "list.txt"
+