rcsdiff -u a/testing.php
===================================================================
RCS file: a/RCS/testing.php,v
retrieving revision 1.3
diff -u -r1.3 a/testing.php
--- a/testing.php      2013/03/14 09:05:54    1.3
+++ a/testing.php      2013/03/14 09:08:45
@@ -2,4 +2,5 @@
 echo "Hello World";
 echo "How are you doing today?";
 echo "thanks";
+echo "thanks";
 ?>