基本常用清理linux日志：
# echo > /var/log/wtmp //清除用户登录记录
# echo > /var/log/btmp //清除尝试登录记录
# echo>/var/log/lastlog //清除最近登录信息
# echo > /var/log/secure //登录信息
# echo > /var/log/messages
# echo>/var/log/syslog //记录系统日志的服务
# 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
清除操作过的命令记录
# echo > .bash_history //清除保存的用户操作历史记录
# history -cw //清除所有历史
