查询DDOS攻击IP列表 grep -i

[[email protected] ~]# netstat -an|grep -i syn_recv|awk ‘{print $5}‘|awk -F\: ‘{print $1}‘|sort|uniq -c
      1 149.56.41.159

grep -i (不区分大小写)

[[email protected] Desktop]# grep -i "test" test.txt
this is test
THIS IS TEST 1
this is TEST 2
this is test3
[[email protected] Desktop]# grep  "test" test.txt
this is test
this is test3