Passing arguments by reference

Question

I want to ask if it is possible to pass arguments to a script function by reference:

i.e. to do something that would look like this in C++:

Answer 1

This is what works for me on Ubuntu bash shell

#!/bin/sh

iteration=10

increment_count()
{
  local i
  i=$(($1+1))
  eval ${1}=\$i
}


increment_count iteration
echo $iteration #prints 11
increment_count iteration
echo $iteration #prints 12