Summary :
Rotates, compresses, removes and mails system log files
Description :
The logrotate utility is designed to simplify the administration of log files on a system which generates a lot of log files. Logrotate allows for the automatic rotation compression, removal and mailing of
log files. Logrotate can be set to handle a log file daily, weekly, monthly or when the log file gets to a certain size. Normally, logrotate runs as a daily cron job
原文：http://www.cnblogs.com/doscho/p/7289557.html