title: Unable to run spark-shell from bin
body: <p>I'm new to spark, I downloaded precompiled spark.  </p>
  
  <p>When I try to run spark-shell from <strong>bin</strong> folder on command line, it returns </p>
  
  <blockquote>
    <p><code>:cd /users/denver/spark-1.6/bin</code><br>
        <code>:spark-shell</code></p>
    
    <p>command not found</p>
  </blockquote>
  
  <p>But if I run it like </p>
  
  <blockquote>
    <p><code>:cd /users/denver/spark-1.6</code><br>
      <code>:./bin/spark-shell</code></p>
  </blockquote>
  
  <p>it launches spark ..  </p>
  
  <p>can you please let me know why it is throwing error in the 1st case </p>