title: how I could get a echo output if file is empty in linux bash?
body: <p>I have a simple command for identify when file is empty but not works</p>
  
  <pre><code> MN=$(echo "$(cat   empty)") ;
  
  if [ MN == "" ]; then echo "This file is empty"; else echo "This file has been edited. You'll need to do it manually."; fi
  </code></pre>
  
  <p>whats I doing wrong </p>
  
  <p>Please help me</p>