diff --git a/Labb8/diskusage.sed b/Labb8/diskusage.sed
new file mode 100644
index 0000000..e555055
--- /dev/null
+++ b/Labb8/diskusage.sed
@@ -0,0 +1,2 @@
+1d
+s/\%//
diff --git a/Labb8/ovning3.sh b/Labb8/ovning3.sh
new file mode 100755
index 0000000..120dac9
--- /dev/null
+++ b/Labb8/ovning3.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Jack-Benny Persson
+# LX13
+# Exercise 3, lab 8 (Write a script to warn when disk usage exceeds 80%)
+
+# Binaries
+Df="/bin/df"
+Sed="/bin/sed"
+Awk="/usr/bin/awk"
+Logger="/usr/bin/logger"
+
+# Variables
+DiskSed="diskusage.sed"
+Warn=80
+
+# Sanity checks
+for Bin in $Df $Sed $Awk $Logger; do
+	if [ ! -x $Bin ]; then
+		echo "Can't execute $Bin"
+		exit 1
+	fi
+done
+
+# Put the usages in an array
+Usages=(`$Df -h | $Awk '{print $5}' | $Sed -f $DiskSed`)
+
+# Put all the disknames in an array
+Disks=(`$Df -h | $Awk '{print $1}'| $Sed '1d'`)
+
+# Start the loop to check the disk usage
+Index=0
+for i in ${Usages[@]}; do
+	if [ $i -gt $Warn ]; then
+		echo "Disk ${Disks[$Index]} is ${i}% full" >&2
+		$Logger "Disk ${Disks[$Index]} is ${i}% full"
+	fi 
+	((Index++))
+done
+
+exit 0