diff --git a/script.sh.template b/script.sh.template
index 05b7933..8750403 100644
--- a/script.sh.template
+++ b/script.sh.template
@@ -3,16 +3,13 @@ echo ============================== >> {{script_log_fp}}
 env >> {{script_log_fp}}
 
 iptable_check_add(){
-    local x="$@"
-    iptables -C $x 2>/dev/null || iptables -A $x
+    iptables -C $@ 2>/dev/null || iptables -A $@
 }
 iptable_nat_check_add(){
-    local x="$@"
-    iptables -t nat -C $x 2>/dev/null || iptables -t nat -A $x
+    iptables -t nat -C $@ 2>/dev/null || iptables -t nat -A $@
 }
 iptable_mangle_check_add(){
-    local x="$@"
-    iptables -t mangle -C $x 2>/dev/null || iptables -t mangle -A $x
+    iptables -t mangle -C $@ 2>/dev/null || iptables -t mangle -A $@
 }
 
 # create route table if it does not exist
@@ -25,8 +22,8 @@ if [ $(getent group|grep {{route_table_name}} | wc -l) -eq 0 ]; then
     groupadd {{route_table_name}}
 fi
 
-iptable_mangle_check_add -I OUTPUT -m owner --gid-owner {{route_table_name}} -j MARK --set-mark {{route_table_id}}
-iptable_nat_check_add -t nat -I POSTROUTING -m owner --gid-owner {{route_table_name}} -o ${dev} -j MASQUERADE
+iptable_mangle_check_add OUTPUT -m owner --gid-owner {{route_table_name}} -j MARK --set-mark {{route_table_id}}
+iptable_nat_check_add POSTROUTING -m owner --gid-owner {{route_table_name}} -o ${dev} -j MASQUERADE
 # populate route table
 ip route flush table {{route_table_name}}
 ip route add ${route_vpn_gateway} dev ${dev} src ${ifconfig_local} table {{route_table_name}}
@@ -37,6 +34,6 @@ ip route add ${route_vpn_gateway} dev ${dev} src ${ifconfig_local}
 
 ip rule add fwmark {{route_table_id}} table {{route_table_name}} pref {{rule_pref}} 
 #ip rule add from ${ifconfig_local} table {{route_table_name}} pref {{rule_pref}}
-iptable_check_add -I OUTPUT -m mark --mark {{route_table_id}} -j ACCEPT
+iptable_check_add OUTPUT -m mark --mark {{route_table_id}} -j ACCEPT
 
 exit 0
diff --git a/test.sh b/test.sh
deleted file mode 100755
index 2b532e4..0000000
--- a/test.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/sh
-
-iptable_check_add(){
-    local x="$@"
-    iptables -C $x 2>/dev/null || iptables -A $x
-}