创建下面这个文件freemem.sh，我放在/opt/freemem目录下。
#!/bin/sh Time1=`date +%Y%m%d` Time2=`date +%k:%M:%S` cd /var/log/freemem # #echo "">memstat_$Time1.log # echo $Time1--$Time2 >>memstat_$Time1.log echo "------------------" >>memstat_$Time1.log echo "The mem stat is :" >>memstat_$Time1.log echo "" >>memstat_$Time1.log free -m >>memstat_$Time1.log echo "" >>memstat_$Time1.log #sync echo "....Freeing......" >>memstat_$Time1.log echo "">>memstat_$Time1.log # echo 1 > /proc/sys/vm/drop_caches echo 2 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches echo "---> OK ! " >>memstat_$Time1.log echo "">>memstat_$Time1.log free -m >>memstat_$Time1.log echo "=========================================================================">> memstat_$Time1.log echo "">>memstat_$Time1.log echo "">>memstat_$Time1.log cd - cat /var/log/freemem/memstat_$Time1.log
给予执行权限
chmod 755 /opt/freemem/freemem.sh
创建日志目录
mkdir /var/log/freemem
定时执行freemem.sh
以crontab方式：
vim /etc/crontab #每隔6小时执行一次 * */6 * * * root /opt/freemem/freemem.sh