diff --git a/Labb6/ovning5.sh b/Labb6/ovning5.sh
index d2d40d2..052dae6 100755
--- a/Labb6/ovning5.sh
+++ b/Labb6/ovning5.sh
@@ -1,10 +1,46 @@
 #!/bin/bash
 
-for i in `df -h | awk '/\/dev\/sd*/ { print $1 }'`; do
-	Disk[$Nr]=$i
+# Jack-Benny Persson
+# LX13
+# Övning 5, labb 6
+# Monitor disk usage and send a warning if it exceeds N%
+
+# Set some variables
+Df="/bin/df"
+Awk="/usr/bin/awk"
+Sed="/bin/sed"
+Warn=80 # Warn a how many percent full?
+
+# Sanity checks
+for bin in $Df $Awk $Sed; do
+	if [ ! -x $bin ]; then
+		echo "Can't execute $bin"
+		exit 2
+	fi
+done
+
+# Get the disks
+for dev in `df -h | awk '/\/dev\/sd*/ { print $1 }'`; do
+	Disk[$Nr]=$dev
 	((Nr++))
 done
 
-echo ${Disk[@]}
+# Get the usage percentage
+for percent in `df -h | awk '/\/dev\/sd*/ { print $5 }' | sed 's/%//'`; do
+	Use[$UseNr]=$percent
+	((UseNr++))
+done
 
+
+# Main (Calculate usage and send warnings)
+DiskDev=0
+for i in ${Use[@]}; do
+	if [ $i -gt $Warn ]; then
+		echo "Disk ${Disk[$DiskDev]} is ${Use[$DiskDev]}% full"
+		logger "Disk ${Disk[$DiskDev]} is ${Use[$DiskDev]}% full"
+		((DiskDev++))
+	fi
+done
+
+# Just exit in quiet if no warnings are issued
 exit 0