Added options and arguments to Övning 4, labb 5

Labb5/ovning4.sh

@@ -5,14 +5,85 @@
 # Övning 4, labb 5
 # Grade-calculation script
 
-# Set some variables
+# Set some defaults
 G=30
 VG=48
 Form=form.txt
 
+# Function to print the students grade and points
+print_grade()
+{
+	echo "Your total points on the test was: $Total"
+
+	if [ $Total -lt $G ]; then
+		echo "Your grade is: IG"
+	elif [ $Total -ge $VG ]; then
+		echo "Your grade is: VG"
+	else
+		echo "Your grade is G"
+	fi
+
+	exit 0
+}
+
+# Define help functions
+short_help()
+{
+	printf "Usage: `basename $0` -f <filename>" 
+	printf " -o <filename> -G <int> -VG <int>\n"
+}
+
+long_help()
+{
+	short_help
+	cat <<- EOF
+	-f Optional filename to read the form data from.
+	-o Optional output file for the points and grade.
+	-G Number of minimum points for a grade G (Default is 30).
+	-VG Number of minimum points for a grade VG (Default is 48).
+	EOF
+}
+
+# Pass command line arguments
+while [ -n "$1" ]; do
+	case "$1" in
+	-f) Arg="$2"
+	    if [ ! -r $Arg ]; then
+		echo "Can't read $Arg" > /dev/stderr
+		short_help
+		exit 2
+	    fi
+	    Form="$Arg"
+	    shift 2
+	    ;;
+	-o) Outfile="$2"
+	    if [ ! -w `dirname $Outfile` ]; then
+		echo "You can't write to `dirname $Outfile`"\
+		> /dev/stderr
+		exit 2
+	    fi
+	    shift 2
+	    ;;
+	-G) G=$2
+	    shift 2
+	    ;;
+	-VG) VG=$2
+	     shift 2
+	     ;;
+	-h) long_help
+	    exit 0
+	    ;;
+	*) short_help
+	   exit 2
+	   ;;
+	esac
+ #	shift
+done
+
 # Check if the file exist and that we can read it
 if [ ! -r $Form ]; then
 	echo "Can't read $Form" > /dev/stderr
+	short_help
 	exit 2
 fi
 
@@ -44,14 +115,8 @@ for i in ${Points[*]}; do
 done
 
 # Print the total points and grade
-echo "Your total points on the test was: $Total"
-
-if [ $Total -lt $G ]; then
-	echo "Your grade is: IG"
-elif [ $Total -ge $VG ]; then
-	echo "Your grade is: VG"
+if [ -n $Outfile ]; then
+	print_grade > $Outfile
 else
-	echo "Your grade is G"
+	print_grade
 fi
-
-exit 0