Script to traverse through all folders and files inside a given folder, second argument is indentation level

traverse_folder_recursively.sh

#!/bin/bash
folder="$1"

add_space_indentation () {
  for i in $(eval echo "{1..$1}")
  do
   echo -n '-'
  done
}

list_directories (){
  add_space_indentation $(($2))
  echo "FILES IN $1"
  for f in $1/*
  do
      if [ -d "$f" ] #directory
      then
        list_directories $f $(($2 + 2))
      else #file
        add_space_indentation $(($2))
        echo "$f"
      fi
  done
}

list_directories $folder 1