手动清除内存shell【root权限】
#!/bin/bash#1.system environment variables
cd ~
. ./.bash_profile
#2.define variables
v_freenum=`free -m | sed -e '1d' -e '3d' -e '4d' | awk '{print $4}'`;
v_logpath="/home/webuser/wyk/shell/log";
v_definenum=90;#定义单位M
#if begin
if [[ ${v_freenum} -le ${v_definenum} ]]
then
sync;sync;sync;
echo 1 > /proc/sys/vm/drop_caches;
date >> ${v_logpath}/Free_cache.log;
cat /proc/sys/vm/drop_caches >> ${v_logpath}/Free_cache.log;
v_freenum=`free -m | sed -e '1d' -e '3d' -e '4d' | awk '{print $4}'`;
if [[ ${v_freenum} -gt ${v_definenum} ]]
then
sync;sync;sync;
echo 0 > /proc/sys/vm/drop_caches;
else
sync;sync;sync;
echo 2 > /proc/sys/vm/drop_caches;
date >> ${v_logpath}/Free_cache.log;
cat /proc/sys/vm/drop_caches >> ${v_logpath}/Free_cache.log;
v_freenum=`free -m | sed -e '1d' -e '3d' -e '4d' | awk '{print $4}'`;
if [[ ${v_freenum} -gt ${v_definenum} ]]
then
sync;sync;sync;
echo 0 > /proc/sys/vm/drop_caches;
else
sync;sync;sync;
echo 3 > /proc/sys/vm/drop_caches;
date >> ${v_logpath}/Free_cache.log;
cat /proc/sys/vm/drop_caches >> ${v_logpath}/Free_cache.log;
sync;sync;sync;
echo 0 > /proc/sys/vm/drop_caches;
fi
fi
fi
#if end
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