The Apache manual tells us what the elements are. This command controls various aspects of the parsing. The value sets the format to be used when displaying the size of a file. Valid values are bytes for a count in bytes, or abbrev for a count in kilobytes or megabytes as appropriate. This command prints one of the include variables, defined below.
Any dates printed are subject to the currently configured timefmt .
If the path does not begin with a slash, it is taken to be relative to the current document. The document referenced by this path is invoked as a CGI script, even if the server would not normally recognize it as such. The include variables will be available to the script in addition to the standard CGI environment. If the script returns a Location header instead of output, this is translated into an HTML anchor. If Options NoExec is set in the Config file, this is turned off.