You can use the -n option to preview but not perform updates to the jti file.
jti
Example: java -cp [jt_dir/lib/] javatest.jar com.sun.javatest.EditJTI -n -o mynew.jti -l myeditlog.html "|/java/jdk/1.3/|/java/jck/1.4/|" myoriginal.jti
java -cp
/lib/
javatest.jar com.sun.javatest.EditJTI -n -o
.jti -l
.html "|/java/jdk/1.3/|/java/jck/1.4/|"
.jti