Monitor now ckecks for IP change and invokes email notification

1 files changed, 20 insertions, 3 deletions

diff --git a/monitor.sh b/monitor.sh
index bebc07c..1bf5129 100755
--- a/monitor.sh
+++ b/monitor.sh
@@ -3,14 +3,16 @@
 #  SJP 16 August 2014
 #  Monitor my external IP address
 
-# set up logfile
 
 cd ~/mail/monitor
 
+# set up logfile
 if (test -e data/tmp.*) then
 	datafile=$(ls data/tmp.*)
+	newfile=0
 else
 	datafile=`mktemp --tmpdir=data`
+	newfile=1
 fi
 
 # echo "datafile = $datafile"
@@ -18,10 +20,25 @@ fi
 ip=$(curl ifconfig.me/ip)
 [ ${#ip} = 0 ] && ip="Timed out"
 # Could also do [ -z $ip ]
- 
 dt=$(\date  +%Y-%m-%dT%T%:z)
 
+# either write date + IP to new file or compare IPs
+# write date and IP address to file but delete if it's a dud
+if (test "$newfile" -eq 1) then
+	echo -e "$dt\t$ip" > $datafile
+	[ "$ip" == "Timed out" ] && rm $datafile
+
+else	# datafile already exists, so compare
+	read line < $datafile
+	oldip=$(echo $line | awk '{print $2 }')
+	if (test "$ip" != "$oldip") then
+		. notifynewip.sh
+		rm $datafile
+	fi
+fi
+
+
+
 
-echo -e "$dt\t$ip" >> $datafile