#student marksheet

#1. Add
#2. View
#3. Update
#4. Search
#5. Calculation Percetage


i=1;
j=1;
echo -n "Enter Database Name : "
read sheet

while [ $i = 1 ]
do
	echo "-----------------------------------"
	echo "1. Add Students Record."
	echo "2. View Students Record."
	echo "3. Update Student Record."
	echo "4. Search Student"	
	echo "5. Calculation."
	echo "6. Exit."
	echo "-----------------------------------"
	echo -n "Enter Choose : "	
	read ch

	case $ch in
	
	1)	#Add_Record
		echo -n "Enroll  : "
		read er;

		echo -n "Student Name : "
		read name;

		echo -n "Subject 1 : "
		read sub1;

		echo -n "Subject 2 : "
		read sub2;
		
		echo -n "Subject 3 :  "
		read sub3;

		echo "$er | $name | $sub1 | $sub2 | $sub3" >> $sheet;
		;;

	2)	#Display_List
		sort -n -k1 $sheet;
		;;

	3)	#Update_Command
		sort -n -k1 $sheet;
		echo -n "Enter Student Enroll : "
		read n;
		
		grep -i "$n" $sheet | tee x;
		wc -c x | tee y;
		a=`cut -d " " -f 1 y`
		if [ "$a" = 0 ]
		then
			echo "Record not found"
		else	
			echo -n "Enroll  : "
			read er;

			echo -n "Student Name : "
			read name;
	
			echo -n "Subject 1 : "
			read sub1;

			echo -n "Subject 2 : "
			read sub2;
		
			echo -n "Subject 3 : "
			read sub3;
			
			grep -v "$n" $sheet | cat > def;
			cat def | tee $sheet;
			echo "$er | $name | $sub1 | $sub2 | $sub3" >> $sheet;
			sort -n -k1 $sheet;
		fi
		;;

	4)	#Search Student
		echo -n "Enter Student Enroll : "
		read ers;
		grep "$ers" $sheet > search.txt
		cat search.txt;
		;;

	5)	#5. Calculation Percetage
		echo -n "Enter Student Enroll : "
		read scal;
		
		grep "$scal" $sheet > scal.txt
		echo "-----------------------------------"
		cat scal.txt
		echo "-----------------------------------"
		s1=0;
		s2=0;
		s3=0;	
		s1=`echo $s1 | cut -d "|" -f3 scal.txt` 
		s2=`echo $s2 | cut -d "|" -f4 scal.txt`
		s3=`echo $s3 | cut -d "|" -f5 scal.txt`

		tot=`expr $s1 + $s2 + $s3`;
		per=`expr $tot / 3`;
		echo "Percentage : $per "%"";	
		echo "-----------------------------------"

		echo "Working"
		if [ $per -ge 70 || $per -ls 60 ]
		then
			echo "Grade is A";
		fi
		;;

	*)	exit
		;;


	esac

	echo -n "Do You Want To Conti... (1 Conti.. / 2 Exit) ? "
	read i
	echo "-----------------------------------"
	if [ $i = 0 ]
	then
		exit
	fi
done