It supports a variety of different methods (diff, html, size, date, MD5 sum,
regexp) and only prints the URIs of the Web pages that changed so that its
output can easily be used by other scripts (such as wget or mail).
WWW: http://pkqs.net/~sbeyer/#netstiff
PR: ports/110686
Submitted by: Alexander Logvinov <ports at logvinov.com>