title: How to use debug log in golang
body: <p>I’ve application which should use log in state of debug. i.e. all the logs that I want to 
  provide is like log.debug </p>
  
  <p>I’ve read about it and find the following</p>
  
  <pre><code>https://github.com/Sirupsen/logrus
  https://github.com/uber-go/zap
  </code></pre>
  
  <p>My question is how should I “tell” to the program that now run at debug mode an then 
  all the logs will be printed since this I believe should come from outside …
  <strong>example will be very helpful</strong> since Im new to golfing .</p>