#!/bin/bash

myfunc() {
  local x y=hello  # x,y local, y inited
  x=hi
  echo myfunc "$x" "$y"
}

x=1
y=2
myfunc
echo toplevel "$x" "$y"


# The following shows dynamic scoping, the opposite of lexical scoping.
# Lexical scoping is what you have always known from sane languages.

echo
echo 'Dynamic scoping demo:'

z=good

victim() {
  echo "$z"
  # dynamic scoping => z from caller, not from code structure
}

mitm() {
  local z=evil
  victim
}

echo -n 'mitm ' ; mitm
echo -n 'toplevel ' ; victim