linux释放内存脚本

#!/bin/bash

freemem=$(cat /proc/meminfo | grep "MemFree" | awk '{print $2}')
if [ $freemem -le 23500000 ];then
        date >> /tmp/mem.log
        free -m >> /tmp/mem.log
        sync
        sync
        echo 3 > /proc/sys/vm/drop_caches
        free -m >> /tmp/mem.log
fi