Write a shell script to print sum of digit of any number

Write a shell script to print sum of digit of any number

echo -n "Enter number : "

read n

# store single digit

sd=0

# store number of digit

sum=0

# use while loop to caclulate the sum of all digits

while [ $n -gt 0 ]

do

    sd=$(( $n % 10 )) # get Remainder

    n=$(( $n / 10 ))  # get next digit

    sum=$(( $sum + $sd )) # calculate sum of digit

done

echo  "Sum of all digit  is $sum"

Ouput:

[root@localhost shell_script]# bash sumofdigit.sh

Enter number : 123

Sum of all digit  is 6