Shell 定时备份日志文件

#!/bin/sh
sys=`uname`
if [ "$sys" = "Linux" ];then
        . ${HOME}/.bash_profile
else
        . ${HOME}/.profile
fi

dateStr=`date +"%Y%m%d%H%M"`
fsize=`du -ks /opt/tmailer/log/freshclam.log|awk '{print $1}'`

if [ $fsize -gt 1024 ];then
cp /opt/tmailer/log/freshclam.log  /opt/tmailer/log/freshclam.$dateStr > /dev/null 2>&1 &
cat /dev/null > /opt/tmailer/log/freshclam.log
fi
chown -Rf tmailer:tmailer /opt/tmailer/log >/dev/null 2>&1 &