Apache Logs (Awstats)

The Apache httpd.conf directive "LogFormat" defines a log formatting that can then be referenced using its name. The following 2 examples define the log formats named: "combinedv" and "combined".

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %V" combinedv
CustomLog pathtoyourlog/yourlog.log combinedv

Or the standard NCSA combined/XLF/ELF format (this format should already be defined in the distribution httpd.conf file).
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\"" combined
CustomLog /yourlogpath/yourlogfile combined

The CustomLog item is required, if you want to use a specified LogFormat and save the logs in a specific folder. Usually webmasters will want to save logs for each site in the appropriate "site" folder.

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For log rotation "ala" IIS, you need to use the "piped logfile" feature. This will pipe/send all the logs to a external program that will then be responsible for the rotation of the logs.

You can simulate the IIS log naming using string substitutions:
%y 2-digit year
%m 2-digit month
%d 2-digit day of month
Ref: http://httpd.apache.org/docs/2.2/programs/rotatelogs.html#portability

To imitate IIS type log filenames, I use log files defined with: ex%y%m%d.log
Here is what my log definition looks like in my "VirtualHost":
CustomLog "|E:/Apache220/bin/rotatelogs.exe E:/DomZeus/sitebuddycom/W3SVC1066/ex%y%m%d.log 86400" combined

Important Update: The 2 tested log rotation programs rotatelogs.exe and cronolog.exe are dangerous, see:
http://www.sitebuddy.com/Apache_Rotatelogs.exe_Bug

Ref: http://httpd.apache.org/docs/2.2/programs/rotatelogs.html

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For Awstats:
Examples for Apache combined logs (following two examples are equivalent):
LogFormat = 1
LogFormat = "%host %other %logname %time1 %methodurl %code %bytesd %refererquot %uaquot"

So if you are using the "combined" log format, you can set "LogFormat = 1" for yoursite.

Note:
LogFormat Directive scope: server config, virtual host (Module: mod_log_config)
CustomLog Directive scope: server config, virtual host (Module: mod_log_config)
TransferLog Directive scope: replaced with CustomLog
This directive is a limited version of CustomLog.

Ref: http://httpd.apache.org/docs/2.2/mod/mod_log_config.html
http://httpd.apache.org/docs/2.2/programs/rotatelogs.html
http://awstats.sourceforge.net/docs/awstats_config.html#LogFormat
http://httpd.apache.org/docs/2.2/mod/mod_log_config.html#customlog