title: What is bang dollar (!$) in Bash?
body: <p>Bang dollar seems to refer to the last part of the last command line. </p>
  
  <p>E.g. </p>
  
  <pre><code>$ ls -l
   .... something
  $ !$
  -l
  bash: -l command not found
  </code></pre>
  
  <p>I can find plenty on the dollar variables (e.g. <code>$!</code>) but not on this. Any explanation?</p>