Multiply digits within a number with each other

Question

I have list of numbers, and I want to multiply the digits within each number with each other; e.g. for the number 1234 it is 1 X 2 X 3 X 4 = 24

E.g. the following input

7675342567
098765342567
1234567890
0987654
234567
8765678
98
0999
09876543
345678
876543
87654

needs the following result:

How should I proceed?

Sorry but this is not a scripting service. If you do not know any shell scripting, you'd start learning. — andcoz, Oct 08 '18 at 15:39
@andcoz i don't like programming and it is not my hobby, I have problem and I need help what is wrong with that? — Sydney, Oct 08 '18 at 15:40
Sydney: The problem is that this site teaches people programming. If you don't care about the "how", pay someone to solve the problem for you. — choroba, Oct 08 '18 at 15:50
"what is wrong with that?" is a complex question, please read this: How do you feel about “GIVE ME TEH CODEZ” questions? — andcoz, Oct 08 '18 at 15:52
If any of the answers solved your problem, please accept it by clicking the checkmark next to it. Thank you! — Jeff Schaller, Oct 21 '18 at 14:41

score 6 · Answer 1 · edited Oct 08 '18 at 15:47

6

You can do it this way:

<file sed 's/./&*/g;s/*$//' | bc

7408800
0
0
0
5040
564480
72
0
0
20160
20160
6720

With GNU sed, that can be simplified as:

<file sed 's/./*&/2g' | bc

edited Oct 08 '18 at 15:47

answered Oct 08 '18 at 15:38

score 1 · Answer 2 · answered Oct 09 '18 at 00:58

1

Strictly within bash, assuming you don't overflow beyond 9 quintillion and change (9,223,372,036,854,775,807),

while IFS= read -r 
do 
  res=1
  for((i=0;i<${#REPLY};i++))
  do 
    res=$((res * ${REPLY:i:1}))
  done
  echo "$res"
done < input > output

answered Oct 09 '18 at 00:58

Jeff Schaller

2 Answers2