title: what is the result of this linux command
body: <p>I came across the following shell in Linux,</p>
  
  <pre><code>alias   eg    'env | grep \!*'
  </code></pre>
  
  <p>After sourcing the above she'll, The result of executing this
      eg apple
  Is to show all lines that contains "apple"</p>
  
  <p>I have no clue what is the syntax behind !*, can someone help explain?
  Please be specific on each sign. like what does backslash do, as well as exclamation and *</p>