1,查看apache進程:

ps aux | grep httpd | grep -v grep | wc -l

2,查看80端口的tcp連接:

netstat -tan | grep "ESTABLISHED" | grep ":80" | wc -l

3,通過日志查看當天ip連接數，過濾重復:

cat access_log | grep "20/Oct/2008" | awk '{print $2}' | sort | uniq -c | sort -nr

4,當天ip連接數最高的ip都在干些什么(原來是蜘蛛):

cat access_log | grep "20/Oct/2008:00" | grep "122.102.7.212" | awk '{print $8}' | sort | uniq -c | sort -nr | head -n 10

5,當天訪問頁面排前10的url:

cat access_log | grep "20/Oct/2008:00" | awk '{print $8}' | sort | uniq -c | sort -nr | head -n 10

6,用tcpdump嗅探80端口的訪問看看誰最高

tcpdump -i eth0 -tnn dst port 80 -c 1000 | awk -F"." '{print $1"."$2"."$3"."$4}' | sort | uniq -c | sort -nr
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接著從日志里查看該ip在干嘛:
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cat access_log | grep 122.102.7.212| awk '{print $1"/t"$8}' | sort | uniq -c | sort -nr | less

7,查看某一時間段的ip連接數:

grep "2006:0[7-8]" www20060723.log | awk '{print $2}' | sort | uniq -c| sort -nr | wc -l