title: How to push update to a branch in github
body: <p>Let me know what I am doing wrong here ?</p>
  
  <p>When I am doing <code>$git status</code> it is showing my branch as <code>* my_branch</code></p>
  
  <p>Now I changed in few files and trying to push updates to the branch so I tried two things -</p>
  
  <p>1) <strong>First try</strong></p>
  
  <p><code>$ git add .</code></p>
  
  <p><code>$ git push origin my_branch</code></p>
  
  <p>This is showing <code>Everything up-to-date</code></p>
  
  <p>2) <strong>Second try</strong></p>
  
  <p><code>$ git add .</code></p>
  
  <p><code>git commit -m "first commit"</code></p>
  
  <p>Now on running this I am getting following error -</p>
  
  <pre><code>*** Please tell me who you are.
  
  Run
  
    git config --global user.email "you@example.com"
    git config --global user.name "Your Name"
  
  to set your account's default identity.
  Omit --global to set the identity only in this repository.
  
  fatal: unable to auto-detect email address (got 'trialcoder@sysuser.(none)')
  </code></pre>