title: Convert string to hexadecimal on command line
body: <p>I'm trying to convert "Hello" to <code>48 65 6c 6c 6f</code> in hexadecimal as efficiently as possible using the command line.</p>
  
  <p>I've tried looking at <code>printf</code> and google, but I can't get anywhere.</p>
  
  <p>Any help greatly appreciated.</p>
  
  <p>Many thanks in advance,</p>