--- a/xe-update-guest-attrs
+++ b/xe-update-guest-attrs
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # Copyright (C) 2009  Citrix Systems Inc.
+# Copyright (C) 2014  Christopher J. Camisa
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
@@ -51,10 +52,10 @@
 
 # parse command line opts
 
-MEMORY_MODE=0 # do not update memory stats 
-while [ $# -ge 1 ] ; do 
+MEMORY_MODE=0 # do not update memory stats
+while [ $# -ge 1 ] ; do
     if [ "$1" = "--memory" ] ; then
-	MEMORY_MODE=1	# update only memory stats 
+	MEMORY_MODE=1	# update only memory stats
     fi
     shift
 done
@@ -71,12 +72,12 @@
 	fi
     else
 	# cache does not exist
-	if [ -e $cache ] ; then 
+	if [ -e $cache ] ; then
 	    # something (directory?) in its way
 	    rm -rf $cache
 	fi
     fi
-    
+
     # try to write and update cache if successful
     if $XENSTORE write "$key" "$newval" ; then
 	mkdir -p $(dirname "$cache")
@@ -119,8 +120,8 @@
 xenstore_list_interfaces_cached() {
     topdir=$XS_CACHE/attr
     if [ -d $topdir ] ; then
-	cd $topdir 
-	for dir in * ; do 
+	cd $topdir
+	for dir in * ; do
 	    [ -f $dir/ip ] && echo $dir
 	done
     fi
@@ -131,7 +132,7 @@
     eval $(cat /proc/meminfo | \
 	sed -n -e 's/MemTotal\: *\([0-9]*\)[^$]*/memtotal=\1/gp;' \
         -e 's/MemFree\: *\([0-9]*\)[^$]*/memfree=\1/gp;')
-    
+
     xenstore_write_cached "data/meminfo_total" "${memtotal}"
     xenstore_write_cached "data/meminfo_free" "${memfree}"
 fi
@@ -140,17 +141,17 @@
 
 # e.g.
 # $ ip addr show
-# 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue 
+# 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
 #     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
 #     inet 127.0.0.1/8 scope host lo
-#     inet6 ::1/128 scope host 
+#     inet6 ::1/128 scope host
 #        valid_lft forever preferred_lft forever
 # 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
 #     link/ether 00:13:20:95:e8:74 brd ff:ff:ff:ff:ff:ff
 #     inet 172.31.0.57/20 brd 172.31.15.255 scope global eth0
-#     inet6 fe80::213:20ff:fe95:e874/64 scope link 
+#     inet6 fe80::213:20ff:fe95:e874/64 scope link
 #        valid_lft forever preferred_lft forever
-# 3: sit0: <NOARP> mtu 1480 qdisc noop 
+# 3: sit0: <NOARP> mtu 1480 qdisc noop
 #     link/sit 0.0.0.0 brd 0.0.0.0
 
 #eval $(ip addr show | \
@@ -158,26 +159,26 @@
 #	      -e 's/^[[:space:]]\{4\}inet \('${IPADDR_RE}'\)\/.*/eval inet_\${current}="\1"; /gp;')
 
 # e.g.
-# eth0      Link encap:Ethernet  HWaddr 00:13:20:95:E8:74  
+# eth0      Link encap:Ethernet  HWaddr 00:13:20:95:E8:74
 #           inet addr:172.31.0.57  Bcast:172.31.15.255  Mask:255.255.240.0
 #           inet6 addr: fe80::213:20ff:fe95:e874/64 Scope:Link
 #           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
 #           RX packets:98001128 errors:0 dropped:0 overruns:0 frame:0
 #           TX packets:87728920 errors:0 dropped:0 overruns:0 carrier:0
-#           collisions:0 txqueuelen:1000 
+#           collisions:0 txqueuelen:1000
 #           RX bytes:35864034092 (33.4 GiB)  TX bytes:27544025180 (25.6 GiB)
-#           Interrupt:177 
-# 
-# lo        Link encap:Local Loopback  
+#           Interrupt:177
+#
+# lo        Link encap:Local Loopback
 #           inet addr:127.0.0.1  Mask:255.0.0.0
 #           inet6 addr: ::1/128 Scope:Host
 #           UP LOOPBACK RUNNING  MTU:16436  Metric:1
 #           RX packets:32928 errors:0 dropped:0 overruns:0 frame:0
 #           TX packets:32928 errors:0 dropped:0 overruns:0 carrier:0
-#           collisions:0 txqueuelen:0 
+#           collisions:0 txqueuelen:0
 #           RX bytes:3604609 (3.4 MiB)  TX bytes:3604609 (3.4 MiB)
 
-ifs=`/sbin/ifconfig | sed -n -e 's/^\([a-z0-9]\+\).*/name \1/p' \
+ifs=`/bin/ifconfig | sed -n -e 's/^\([a-z0-9]\+\).*/name \1/p' \
     -e 's/.*inet addr:\('$IPADDR_RE'\) .*/ipv4 \1/p' \
     -e 's+.*inet6 addr: \('$IPADDR6_RE'\)/.*+ipv6 \1+p' | \
 while read tag value; do
@@ -225,9 +226,9 @@
 # build time addons
 xenstore_write_cached "attr/PVAddons/MajorVersion" "6"
 xenstore_write_cached "attr/PVAddons/MinorVersion" "2"
-xenstore_write_cached "attr/PVAddons/MicroVersion" "0" 
+xenstore_write_cached "attr/PVAddons/MicroVersion" "0"
 xenstore_write_cached "attr/PVAddons/BuildVersion" "70442"
-xenstore_write_cached "attr/PVAddons/Installed" "1" 
+xenstore_write_cached "attr/PVAddons/Installed" "1"
 
 # update xenstore if necessary
 if [ $XENSTORE_UPDATED -eq 1 ] ; then