Shell Script to Print the Sum of Digits of a Number

shell script is a computer program designed to be run by the Unix shell, a command-line interpreter. The various dialects of shell scripts are considered to be scripting languages. Typical operations performed by shell scripts include file manipulation, program execution, and printing text. A script that sets up the environment, runs the program, and does any necessary cleanup, logging, etc. is called a wrapper.

In this post, we will write a shell script to accept a number and print the sum of digits.

line 1: number

line 1: sum of digits

The following is the shell script to accept a number and print the sum of digits:

echo enter n
read n
while [ $n -gt 0 ]
r=$(expr $n % 10)
sum=$(expr $sum + $r)
n=$(expr $n / 10)
echo sum is $sum


$ enter n
$ 456
$ sum is 15

Let us know in the comments if you are having any questions regarding this shell script.

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