Shell怎么实现自动化压缩处理日志文件

Shell处理日志,自动保留30天的日志，如果超过14天的日志就自动压缩为gz格式存储下来，这样可以节省磁盘空间，也是定时备份日志，我这里是以日志文件举例的，其它的需求也可以自己根据脚本内容做调整。

#!/bin/sh################################################################# (c) Copyright 2012 Eric. All rights reserved.## Logs expired 30 days.## *cron# 1 6 * * * /bin/sh /var/app/shell/logs_arrange.sh > /var/app/shell/cron_logs_arrange.log###################################################################TODAY=`date +%s`# how many days ago will the logs to be zipPK_DAYS_AGO=14PK_DATEDIFF=`expr ${PK_DAYS_AGO} \* 86400`PK_EXT=gz# how many days ago will the logs to be removedDAYS_AGO=30DATEDIFF=`expr ${DAYS_AGO} \* 86400`cleanDir(){directory=$1if [[ -d ${directory} ]];thenfor file in `ls -1 ${directory} | grep -v '.log$'`;doctime=`stat -c %Y ${directory}/${file}`timediff=`expr ${TODAY} - ${ctime}`extname=`ls ${directory}/${file} | awk -F '.' '{printf $NF}'`if [[ ${extname} != ${PK_EXT} ]] ; thenif [[ -f ${directory}/${file} ]] ; thenzipta=`expr ${timediff} - ${PK_DATEDIFF}`if [[ ${zipta} -gt 0 ]] ; thenecho "Package ${directory}/${file}"gzip -f ${directory}/${file} > ${directory}/${file}.${PK_EXT}fififiif [[ -f ${directory}/${file} ]];thendelta=`expr ${timediff} - ${DATEDIFF}`if [[ ${delta} -gt 0 ]];thenecho "Removing ${directory}/${file}"rm -rf ${directory}/${file}fifidonefi}cleanDir "/var/app/logs/webapps/admin"cleanDir "/var/app/logs/webapps/api"cleanDir "/var/app/logs/webapps/pos"