diff --git a/Labb4/ovning3_script2.sh b/Labb4/ovning3_script2.sh
index ff3c63d..bcd004a 100755
--- a/Labb4/ovning3_script2.sh
+++ b/Labb4/ovning3_script2.sh
@@ -4,5 +4,19 @@
 # LX13
 # Övning 3, script 2, labb4
 
+# Testing parameter substiution
+
+Arg1="$1"
+
+echo "Hej ${USER}@${HOSTNAME}"
+echo ""
+echo "Variabler på U: ${!U*}"
+echo "Variabler på S: ${!S*}"
+echo ""
 
 
+echo ${Arg1:?"No arg1 input"}
+
+echo "Du skrev in ${#Arg1} tecken som argument till $0"
+
+exit 0
diff --git a/jack.sh b/jack.sh
new file mode 100755
index 0000000..bdb5f04
--- /dev/null
+++ b/jack.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# Jack-Benny Persson
+# LX13
+# From the classic movie The Shining
+
+Text=(A l l " " w o r k " " a n d " " n o " " p l a y " " m a k e s " " \
+J a c k " " a " " d u l l " " b o y "." " " )
+
+while true
+do
+	SemiRand=`date +%S`
+	if [ $SemiRand -eq 10 ] || [ $SemiRand -eq 45 ]; then
+		printf "\n"
+	fi
+
+	if [ $SemiRand -eq 15 ] || [ $SemiRand -eq 35 ] || \
+		[ $SemiRand -eq 36 ] || [ $SemiRand -eq 37 ]; then
+		printf "\n\n\t"
+	fi
+
+	for i in "${Text[@]}"
+	do
+		sleep 0.05
+		printf "$i"
+	done
+done
+
+exit 0