Index: nutchez-0.2/src/test/duplicate_del
===================================================================
--- nutchez-0.2/src/test/duplicate_del	(revision 162)
+++ nutchez-0.2/src/test/duplicate_del	(revision 165)
@@ -11,4 +11,5 @@
 # Delete duplicating ip addresss in file
 IPs=$(cat $1 | grep -v 'ip6' | grep -v '#' | grep -v '^$' | awk '{print $1}')
+cp -f $1 ${1}.bak
 
 for ip_add in $(echo $IPs)
@@ -30,5 +31,5 @@
 do
     # line numbers
-    host_nu=$(cat -n $1 | grep $host | awk '{print $1}')
+    host_nu=$(cat -n $1 | grep "$host\$" | awk '{print $1}')
     host_count=$(echo $host_nu | wc -w)