10_function.bash

#!/usr/bin/env bash

# # Function must be defined before we can use it
my_func () {
  echo "Hello, it's $USER, this is my 1st bash function! This function name is $FUNCNAME"
}

my_func

# Function parameters
greeting () {
  local foo="Foooo" # Local variables are only available in the function
  bar="Bazzz"
  if [[ $1 ]]; then
    echo "Hello, $1"
  else
    echo "Hello, the unknown!"
  fi
  return 0
}

greeting "John"
greeting

echo "foo is: $foo"
echo "baz is: $bar"

### Challenge
print() {
  [[ $1 -ge $2 ]] && return
  i=$1
  if [[ $(($i % 2)) == 0 ]]; then
    indent=$(($3 + 1))
    for ((j = 0; j < $indent; j++)); do
      echo -n " "
    done
    echo "$i"
  fi

  print $(($i + 1)) $2 indent
}

main() {
  echo $FUNCNAME
  print $1 $2 0
}

main $1 $2