How to roll over catalina.out in tomcat by script

write a basic shell script and pop it on the cron eg, the one we use to roll the logs and delete old ones is (it leaves 3days of logs for you - still i test, but it looks to work):

1) copy catalina.out to one site and rename it(this will become the archive)
2) clear out catalina.out
3) delete all files over a set age

This script was designed for itterating through a log dir and its sub dirs (hence the use of find) deleting all files over a set age and rolling those that didnt roll themselves.

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    #!/bin/ksh 
    export DAYS=$1 
    export LOG_DATE=`date '+%G%m%d'` 
    if [ -z "$DAYS" ] 
    then 
            echo "Missing argument : You must define how many days (from  the  beginning" 1>&2 
            echo "                   of today) logs you wish to keep" 1>&2 
            exit 1 
    fi 
      
    find ${LOGAREA} -type f -name 'catalina.out' -exec /bin/cp {} {}.log.$LOG_DATE \; 
    find ${LOGAREA} -type f -name 'catalina.out' -exec /bin/cp /dev/null {} \; 
    find ${LOGAREA} -type f -name 'catalina.out.*' -mtime +${DAYS} -exec /bin/rm -f {} \; 
    exit 0