Count the number of digits in a bash variable

Question

I have a number num=010. I would like to count the number of digits contained in this number. If the number of digits is above a certain number, I would like to do some processing.

In the above example, the number of digits is 3.

Thanks!

Answer 1

Assuming the variable only contains digits then the shell already does what you want here with the length Shell Parameter Expansion.

$ var=012
$ echo "${#var}"
3