ndiff -V (return code: 2)
/usr/bin/ndiff: option --version not recognized
Try '/usr/bin/ndiff -h' for help.
ndiff --help (return code: 0)
Usage: /usr/bin/ndiff [option] FILE1 FILE2
Compare two Nmap XML files and display a list of their differences.
Differences include host state changes, port state changes, and changes to
service and OS detection.
-h, --help display this help
-v, --verbose also show hosts and ports that haven't changed.
--text display output in text format (default)
--xml display output in XML format