Bash shell script to find sum of digits

Given a number Num, find the sum of digits of the number.

Examples:

Input : 
444
Output :
sum of digits of 444 is : 12

Input :
34
Output :
sum of digits of 34 is : 7



Approach:

1. Divide the number into single digits
2. Find the sum of digits .

Bash

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code

# !/bin/bash
  
# Program to find sum
# of digits
  
# Static input of the
# number
Num=123
g=$Num
  
# store the sum of 
# digits
s=0
  
# use while loop to
# caclulate the sum
# of all digits
while [ $Num -gt 0 ]
do
    # get Remainder
    k=$(( $Num % 10 )) 
  
    # get next digit
    Num=$(( $Num / 10 ))
  
    # calculate sum of
    # digit  
    s=$(( $s + $k )) 
done
echo  "sum of digits of $g is : $s"

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Output

sum of digits of 123 is : 6


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