pwebstats will analyse a www server log in Common Log Format, including CERN proxy logs, or squid format, producing a variety of statistics. The output is a series of HTML pages and graphs. Features include: growth in requests over time, distribution of hosts accessing the server, distribution of accesses per hour through the day, aggregate accesses, per day/hour/minute, per host, bytes transferred changes since last summary period. Analysing a proxy server, pwebstats produces information for both the hosts accessing the server and those accessed by the server, statistics for individual pages or collections using powerful PERL pattern matching, and more. It requires a C program called fly to create the graphs.