Monday, February 26, 2007
Sum of all digits of a number: BASH beginner
Here is my trick for the same.
$ echo "12334"
12334
$ echo "12334" | sed 's/[0-9]/ + &/g' ##mind the spaces before and after +
+ 1 + 2 + 3 + 3 + 4
$ echo "12334" | sed 's/[0-9]/ + &/g' | sed 's/^ +//g' ## Space bet ^ and +
1 + 2 + 3 + 3 + 4
$ expr `echo "12334" | sed 's/[0-9]/ + &/g' | sed 's/^ +//g'`
13
And this is the traditional script for the same.
#!/bin/sh
#Sum of all digits in a number
num=12334
tot=0
mod=0
echo "Number= $num"
while [ $num -gt 0 ]
do
mod=`expr $num % 10`
tot=`expr $tot + $mod`
num=`expr $num / 10`
done
echo "Sum= $tot"
$ ./sumofdigits.sh
Number= 12334
Sum= 13
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4 comments:
Oh, thank you thank you, thank you!
expr `echo "12334" | sed 's/[0-9]/ + &/g' | sed 's/^ +//g'`
It was just what I was looking for, quite creative of you :)
Quite creative of you! Just the function I was looking for.
Oh, thank you thank you, thank you!
expr `echo "12334" | sed 's/[0-9]/ + &/g' | sed 's/^ +//g'`
It was just what I was looking for, quite creative of you :)
@Valpskott, thanks a lot.
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