How to noindex for certain custom post type without using plugins..?

Go in your header.php and add the following snippet where you want your tag to appear:

<?php 
if( 'your-post-type' === get_post_type() ){
  print '<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">';
}
?>

get_post_type() will return the current post type.

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