title: -bash: ls: command not found
body: <p>I have setup react-native in my system.
  I have mac OS X El Capitan.</p>
  
  <p>After completing setup of react native, whenever i open my terminal and type command ls then, it shows "command not found".</p>
  
  <pre><code>export PATH="/usr/bin:/bin:/usr/sbin:/sbin"
  export PATH="/usr/local/bin:/usr/local/sbin:$PATH"
  </code></pre>
  
  <p>After executing above two lines in my terminal, everything works fine. ls command is working after that. But once i close my terminal and again open it, ls command stops working and it shows "command not found".</p>
  
  <p>I have also tried to add above two lines in .bash_profile file, but didn't get success. I don't know how to get rid of this issue.</p>