title: Delete Line if it contains letters - Linux
body: <p>I have this command <code>sed -i 's/[A-Za-z]//g' file.txt</code> that gets rid of any letters in my file but now have come to the realization that I need to be a little more steep with these errors. </p>
  
  <p>How can I alter this command to Delete the line completely if there is letters in it?</p>
  
  <p><code>000000asd000,12
   000000000000,123</code></p>
  
  <p>Would go to this
  <code>000000000000,123</code></p>