You can include the -v option to echo results of your edit.
Example: java -cp [jt_dir/lib/]javatest.jar com.sun.javatest.EditJTI -n -v -o mynew.jti -l myeditlog.html "|/java/jdk/1.3/|/java/jck/1.4/|" myoriginal.jti
java -cp [jt_dir/lib/]javatest.jar com.sun.javatest.EditJTI -n -v -o mynew.jti -l myeditlog.html "|/java/jdk/1.3/|/java/jck/1.4/|" myoriginal.jti