Write a script for generating a mark sheet after reading data from a file. File contains student roll no, name , marks of three subjects

clear
len=`cat student.txt | wc -l`
i=1
echo "\n\n\tSTUDENT MARKSHEET"
echo "\t=================\n"
echo "NAME \t \t TOTAL \t \t PERCENTAGE \t GRADE "
echo "====================================================="
while [ $i -le $len ]
do
 record=`head -n $i student.txt | tail -n 1`
 total=0
 for (( j=2 ; $j < 5 ; j=`expr $j + 1` ))
 do
  marks=`echo $record | cut -d " " -f $j`
  total=`expr $total + $marks`
 done
 name=`echo $record | cut -d " " -f 1`
 per=`expr $total / 3`
if [ $per -ge 85 ] && [ $per -le 100 ] ; then
    grade="AA"
 elif [ $per -ge 75 ] && [ $per -le 84 ] ; then
    grade="AB"
 elif [ $per -ge 65 ] && [ $per -le 74 ] ; then
    grade="BB"
 elif [ $per -ge 55 ] && [ $per -le 64 ] ; then
    grade="BC"
 elif [ $per -ge 45 ] && [ $per -le 54 ] ; then
    grade="CC"
 elif [ $per -ge 0 ] && [ $per -le 44 ] ; then
    grade="FAIL"
 else
    grade="-"
 fi

 echo "$name \t \t $total \t \t $per % \t \t $grade"
 i=`expr $i + 1`
done

Output: 

Posted in: Shell Script