Why don't you do it like RHEL, CentOS and Fedora with logrotate? http://pkgs.fedoraproject.org/gitweb/?p=tomcat.git;a=blob;f=tomcat-7.0.logrotate;h=a87b4c005cce267f7ffc6625a44b4a8ff3fad77b;hb=HEAD
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