查看root登录失败记录数：
cat /var/log/secure |grep 'Failed password for root' | wc -l
查看root登录失败的最后20条记录：
cat /var/log/secure |grep 'Failed password for root' | head -n 20
查看root登录失败记录数：
cat /var/log/secure |grep 'Failed password for root' | wc -l
查看root登录失败的最后20条记录：
cat /var/log/secure |grep 'Failed password for root' | head -n 20
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