The output is an HTML file that makes it easy to check references. The script should be edited to discard normal error messages, where normal is dependent on your particular server.
More info and the latest version of wwwerrs can be obtained from
http://www.ics.uci.edu/pub/websoft/wwwstat/
ftp://www.ics.uci.edu/pub/websoft/wwwstat/
If you have any suggestions, bug reports, fixes, or enhancements, please join the <wwwstat-users@ics.uci.edu> mailing list by sending e-mail with "subscribe" in the subject of the message to the request address <wwwstat-users-request@ics.uci.edu>. The list is archived at the above address.