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I'm trying to write sum of digits of an integer in shell but i have come across an error which is something like this "scriptprog5.sh: line 4: [: : integer expression expected"..

My code is:

read n  
sd=0  
sum=0  
while [ "$n" -gt 0 ]
do  
sd=`expr $n % 10`  
sum=`expr $sum + $sd`  
n=`expr $n / 10`  
done  
echo "Sum of digit for given number is $sum"

Please help...

Improve this question
4
  • 1
    Work fine with sh for me. Probably, you entered a non-numeric or empty input. Check that the input value is a valid integer before going ahead with the rest of the logic. Commented Mar 4, 2018 at 6:17
  • This post may help you: stackoverflow.com/questions/806906/… Commented Mar 4, 2018 at 6:23
  • Worked fine for me as well with sh. As suggested by @codeforester you might have entered non-numeric or empty input. I got the same error as yours when I entered a non-numeric input. Commented Mar 5, 2018 at 5:58
  • Possible duplicate of Bash error: Integer expression expected Commented Mar 26, 2019 at 14:12
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