title: access element of $* (or $@) by index
body: <p>How do I access eleent of $* array (or $@) by index ?<br>
  For example, let's take 3-element array and index=1:</p>
  
  <pre><code>a=( a b c )
  set -- a b c
  echo ${a[1]}
  b               # good
  echo ${*[1]}
  bash: ... bad substitution
  
  echo ${@[1]}
  bash: ... bad substitution
  </code></pre>