Index: iproute/setroute.sh
===================================================================
--- iproute/setroute.sh	(revision 84c2881946d389e9ef241cfbf7434d7dca598196)
+++ iproute/setroute.sh	(revision 4a36a1b26f4cdc2dc3d06d7b3c4ac895b0083b2f)
@@ -1,3 +1,6 @@
 #!/bin/sh
+
+# set individualized routing table and policy for each network device
+
 
 set -x
@@ -29,5 +32,5 @@
 # get IP address, network mask, default gateway info
 IPADDR=`/sbin/ip addr show dev ${IFACE} | grep -w inet | cut -d t -f 2 | cut -d ' ' -f 2 | cut -d / -f 1`
-if [ -z ${IPADDR} ]; then
+if [ -z "${IPADDR}" ]; then
     # fail to bind IP address to device
     echo "${IFACE} has no IP address."