某個目錄日志文件越來越大，定期將日志清理掉，以免撐爆服務器。
另外寫日志時精簡，去掉不必要的日志；
limit-log.sh：控制日志的行數，超過就刪掉之前的。
[monitor]$ more ~/bin/limit-log.sh 
#/bin/shfunction limitlog(){  local logfile=$1  local maxline=$2  linecount=`/usr/bin/wc -l $logfile|awk '{PRint $1}'`;  echo file:$logfile, line count=$linecount. line limit=$maxline.  if [ ${linecount} -gt ${maxline} ];then    delcount=`expr ${linecount} - ${maxline}`;    echo delcount=$delcount    sed -i "1,${delcount}d" $logfile    echo $delcount lines deleted  else    echo do nothing.  fi}#handle monitor.datdatelimitlog /home/monitor/log/monitor.dat 10000000#handle sar.loglimitlog /home/monitor/log/sar.log 20000000#handle redisinfo.logdatelimitlog /home/monitor/log/redisinfo.log 50000000dateecho #############################
其中 sar.log redisinfo.log monitor.dat是要限制的日志文件， 后面的數字是行數。