title: bash associative array key string with colon is giving error
body: <p>I am creating an associative array of source and destination MAC addresses.</p>
  
  <pre><code>$ declare -a SrcDstMap
  $ SrcDstMap["9c:4e:20:73:e2:72"]="ff:ff:ff:ff:ff:ff"
  -bash: 9c: value too great for base (error token is "9c")
  $ SrcDstMap["fc:4e:20:73:e2:72"]="ff:ff:ff:ff:ff:ff"
  -bash: fc:4e:20:73:e2:72: syntax error in expression (error token is ":4e:20:73:e2:72")
  </code></pre>
  
  <p>How can I tell bash that the given key is a whole string.</p>