The contents of the access log is summarized by various criteria.
Summaries are in terms of both the number of requests and the number of bytes transferred.
At least one log file needs to be specified. If several files are given, the contents of the files are aggregated together. To avoid clutter, URLs with certain suffixes, such as .gif or .png, can be grouped together into a single aggregate entry, or ignored altogether. The suffixes should be separated by spaces. The suffixes should be separated by spaces.