centos清除登录信息及命令历史

echo > /var/log/wtmp; echo > /var/log/btmp; echo > /var/log/lastlog; echo > /var/log/secure; echo > /var/log/messages; echo > /var/log/syslog; echo > /var/log/xferlog; echo > /var/log/auth.log;

echo > /var/log/user.log; cat /dev/null > /var/adm/sylog; cat /dev/null > /var/log/maillog; cat /dev/null > /var/log/openwebmail.log; cat /dev/null > /var/log/mail.info; echo > /var/run/utmp;

echo > /root/.bash_history; history -cw;