Arithmetic Operation Bash shell programming in Linux and Unix OS

Shell programming it will perform the basic air thematic operation like addition subtraction, multiplication and division. Using if and else if condition in the bash shell programming. Arithmetic operation is done by the bash shell with expr keyword. It will compare there value by –eq by through equal operation.
Source code bash shell Programming Algorithm
echo "Enter the values"
read i
read j
echo "Enter 1 for addition"
echo "Enter 2 for subtraction"
echo "Enter 3 for multiplication"
echo "Enter 4 for division"
echo "enter choice"
read a
x=1
y=2

z=3
m=4
if [ $a -eq $x ]
then
l=`expr $i + $j`
echo “ The addition is ”
echo $l
elif [ $a -eq $y ]
then
k=`expr $i - $j`
echo “ The subtraction is ”
echo $k
elif [ $a -eq $z ]
then
p=`expr $i \* $j`
echo “ The multipliction is ”
echo $p
elif [ $a -eq $m ]
then
s=`expr $i / $j`
echo “ The division is ”
echo $s
fi


OUTPUT ARITHMETIC OPERATION CS1252 Operating Systems lap
[redhat35@localhost Rhel5]$ sh arithmetic.sh
Enter the values
3
5
Enter 1 for addition
Enter 2 for subtraction
Enter 3 for multiplication
Enter 4 for division
Enter choice
3
The multiplication is
15
MULTIPLICATION TABLE
Source code bash shell Programming Algorithm
echo “ Enter the number ”
read i
echo “ $i table ”
j=1
while [ $i –le 12 ]
do
l=`expr $j \* $j = $l`
echo "$j * $i = $l"
j=`expr $j + 1`
done
OUTPUT MULTIPLICATION TABLE CS1252 Operating Systems lap
[redhat35@localhost Rhel5]$ sh multable.sh
Enter the number
2
2 table
1 * 2 = 2
2 * 2 = 4
3 * 2 = 6
4 * 2 = 8
5 * 2 = 10
6 * 2 = 12
7 * 2 = 14
8 * 2 = 16
9 * 2 = 18
10 * 2 = 20
11 * 2 = 22
12 * 2 = 24