网络命令
1.查看TCP连接状态
netstat -nat |awk ‘{print $6}’|sort|uniq -c|sort -rn
netstat -n | awk ‘/^tcp/ {++S[$NF]};END {for(a in S) print a, S[a]}’
netstat -n | awk ‘/^tcp/ {++state[$NF]}; END {for(key in state) print key,"t",state[key]}’
netstat -n | awk ‘/^tcp/ {++arr[$NF]};END {for(k in arr) print k,"t",arr[k]}’
netstat -n |awk ‘/^tcp/ {print $NF}’|sort|uniq -c|sort -rn
netstat -ant | awk ‘{print $NF}’ | grep -v ‘[a-z]’ | sort | uniq -c
2.查找请求数请20 个IP (常用于查找攻来源):
netstat -anlp|grep 80|grep tcp|awk ‘{print $5}’|awk -F : ‘{print $1}’|sort|uniq -c|sort -nr|head -n20
netstat -ant | awk ‘/:80/ {split($5,ip,":");++A[ip[1]]}END{for(i in A) print A,i}’ |sort -rn|head -n20
3.用tcpdump 嗅探80 端口的访问看看谁最高
tcpdump -i eth0 -tnn dst port 80 -c 1000 |awk -F"." ‘{print $1"."$2"."$3"."$4}’ | sort |uniq -c | sort -nr |head -20
4.查找较多time_wait 连接
netstat -n|grep TIME_WAIT|awk ‘{print $5}’|sort|uniq -c|sort -rn|head -n20
5.找查较多的SYN 连接
netstat -an | grep SYN | awk ‘{print $5}’ |awk -F: ‘{print $1}’ | sort | uniq -c | sort -nr | more
6.根据端口列进程
netstat -ntlp | grep 80 | awk ‘{print $7}’ |cut -d/ -f1
网站日志分析篇1 (Apache):
1.获得访问前10 位的ip 地址
cat access.log|awk ‘{print $1}’|sort|uniq -c|sort -nr|head -10
cat access.log|awk ‘{counts[$(11)]+=1}; END {for(url in counts) print counts[url], url}’
2.访问次数最多的文件或页面,取前20
cat access .log|awk ‘{print $11}’|sort|uniq -c|sort -nr|head -20
3.列出传输最大的几个exe 文件(分析下载站的时候常用)
cat access.log |awk ‘($7~/.exe/){print $10013013 " " $1 " " $4 " " $7}’|sort -nr|head -20
4.列出输出大于200000byte(约200kb)的exe文件以及对应文件发生次数
cat access.log |awk ‘($10 > 200000 && $7~/.exe/){print $7}’|sort -n|uniq -c|sort -nr|head -100
5.如果日志最后一列记录的是页面文件传输时间,则有列出到客户端最耗时的页面
cat access.log |awk ‘($7~/.php/){print $NF " " $1 " " $4 " " $7}’|sort -nr|head -100