# Piped logs can be used for log rotation as well as monitoring
CustomLog "|rotatelogs /var/log/www_log 86400" combined
ErrorLog "|rotatelogs /var/log/www_errors 86400"

# Apache can maintain more than one access log, so you can feed
# access information to a monitor and also to a log file
CustomLog "|exec perl /usr/local/bin/webmon.pl" combined

# Piping error log messages to a monitor is especially useful
# when one wants to detect abuse and/or attacks. Alas, there can
# only be one error log, so you must either rely on access logs
# for error information (usually an acceptable solution) or 
# design your monitor to "tee" the messages to a file for you.
ErrorLog "|exec snobol4 -b /usr/local/bin/wormwatch.sno"