Linux buffer/cache 清理脚本

#!/bin/bash
if [ `free -g|grep -w 'Mem:'|awk '{print$6}'` -ge 4 ];then 
  # buffer/cache 大于4g 开始清理
        sync
        echo 1 > /proc/sys/vm/drop_caches
        echo 2 > /proc/sys/vm/drop_caches
        echo 3 > /proc/sys/vm/drop_caches
fi

#!/bin/bash
if [ `free -g|grep -w 'Mem:'|awk '{print$6+$7}'` -ge 4 ];then 
  # centos 6  buffer+cache 大于4g 开始清理
    sync
    echo 1 > /proc/sys/vm/drop_caches
    echo 2 > /proc/sys/vm/drop_caches
    echo 3 > /proc/sys/vm/drop_caches
fi