1) Find the sum of digits:
#!/bin/bash
number=$1
sum=0
while [ $number -gt 0 ]
do
digit=$(( $number % 10 ))
sum=$(( $sum + $digit ))
number=$(( $number / 10 ))
done
echo “Sum of digits: $sum”
2) Find the average of numbers:
#!/bin/bash
sum=0
count=0
for num in “$@”
do
sum=$(( $sum + $num ))
count=$(( $count + 1 ))
done
average=$(echo “scale=2; $sum / $count” | bc)
echo “Average of numbers: $average”
3) Find the greatest of 3 numbers:
#!/bin/bash
max=$1
for num in “$@”
do
if [ $num -gt $max ]
then
max=$num
fi
done
echo “Greatest number: $max”
4) Add two numbers provided at command line:
#!/bin/bash
sum=$(( $1 + $2 ))
echo “Sum of $1 and $2 is: $sum”
5) Find the factorial of a number:
#!/bin/bash
number=$1
factorial=1
while [ $number -gt 1 ]
do
factorial=$(( $factorial * $number ))
number=$(( $number – 1 ))
done
echo “Factorial of $1 is: $factorial”
6) Check if a given number is positive or negative:
#!/bin/bash
number=$1
if [ $number -gt 0 ]
then
echo “$number is positive”
elif [ $number -lt 0 ]
then
echo “$number is negative”
else
echo “$number is zero”
fi
7) Shell program to find if a number is odd or even:
#!/bin/bash
number=$1
if [ $(( $number % 2 )) -eq 0 ]
then
echo “$number is even”
else
echo “$number is odd”
fi
8) Menu driven program:
#!/bin/bash
echo “Menu:”
echo “1. Find the sum of digits”
echo “2. Find the average of numbers”
echo “3. Find the greatest of 3 numbers”
echo “4. Add two numbers provided at command line”
echo “5. Find the factorial of a number”
echo “6. Check if a given number is positive or negative”
echo “7. Find if a number is odd or even”
echo “8. Exit”
read -p “Enter your choice: ” choice
case $choice in
1)
read -p “Enter a number: ” num
./sum_of_digits.sh $num
;;
2)
read -p “Enter numbers separated by space: ” nums
./average.sh $nums
;;
3)
read -p “Enter three numbers separated by space: ” num1 num2 num3
./greatest_of_three.sh $num1 $num2 $num3
;;
4)
read -p “Enter two numbers separated by space: ” num1 num2
./add_two_numbers.sh $num1 $num2
;;
5)
read -p “Enter a number: ” num
./factorial.sh $num
;;
6)
read -p “Enter a number: ” num
./positive_negative.sh $num
;;
7)
read -p “Enter a number: ” num
./odd_even.sh $num
;;
8)
echo “Exiting program”
exit 0
;;
*)
echo “Invalid choice”
;;
esac
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