less /var/log/secure |grep 'Accepted'
less /var/log/secure |grep 'Failed'
less /var/log/secure |grep 'closed'
查看当前在线用户,顺便可查看机器负载情况 w 或 whoo
清理日志
cat /dev/null > /var/log/wtmp cat /dev/null > /var/log/btmp cat /dev/null > /var/log/lastlog cat /dev/null > /var/log/secure
