title: What is the difference between yarn and yarn install?
body: <p>I am trying to install an additional plugin on Apache Zeppelin using Helium. The Installation command using by Helium to download this package is below:</p>
  
  <pre><code>com.github.eirslett.maven.plugins.frontend.lib.TaskRunnerException: 'yarn install --fetch-retries=2 --fetch-retry-factor=1 --fetch-retry-mintimeout=5000 --registry=https://registry.npmjs.com/ --https-proxy=http://SVC_Hxxxxxp:***@webguard.xxxxx.no:8080 --proxy=http://SVC_Hxxxop:***@webguard.xxxxx.no:8080' failed. (error code 1)
  </code></pre>
  
  <p><strong>Version installed:</strong></p>
  
  <pre><code>node -v
  v8.1.1
  
  
  npm -v
  5.0.3
  
  mvn -v
  Apache Maven 3.3.9
  </code></pre>
  
  <p>How cmd will be able to identify if it is yarn or yarn install ?</p>