1.查看TCP连接状态
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netstat -nat | awk 'NR>2{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[$NF]}; END {for(key in state) print key," ",state[key]}'
netstat -n | awk '/^tcp/ {++arr[$NF]};END {for(k in arr) print k," ",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
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2.按请求数查找前20个IP（常用于查找攻来源）：
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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],i}' |sort -rn|head -n20
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3.用tcpdump嗅探80端口的访问看看谁最高
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tcpdump -i eth0 -tnn dst port 80 -c 1000 | awk -F"." '{print $1"."$2"."$3"."$4}' | sort | uniq -c | sort -nr |head -n 20
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4.查找较多time_wait连接
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netstat -n|grep TIME_WAIT|awk '{print $5}'|sort|uniq -c|sort -rn|head -n20
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5.找查较多的SYN连接
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netstat -an | grep SYN | awk '{print $5}' | awk -F: '{print $1}' | sort | uniq -c | sort -nr | more
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6.根据端口列进程
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netstat -ntlp | grep 80 | awk '{print $7}' | cut -d/ -f1
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7.获得访问前10位的ip地址
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cat access.log|awk '{print $1}'|sort|uniq -c|sort -nr|head -n 10
cat access.log|awk '{counts[$(11)]+=1}; END {for(url in counts) print counts[url], url}'
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8.访问次数最多的文件或页面,取前20
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cat access.log|awk '{print $11}'|sort|uniq -c|sort -nr|head -n 20
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9.列出传输最大的几个rar文件
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cat access.log |awk '($7~/.rar/){print $10 " " $1 " " $4 " " $7}'|sort -nr|head -n 20
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10.列出输出大于200000byte(约200kb)的rar文件以及对应文件发生次数
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cat access.log |awk '($10 > 200000 && $7~/.rar/){print $7}'|sort -n|uniq -c|sort -nr|head -n 100
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11.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
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cat access.log |awk '($7~/.php/){print $NF " " $1 " " $4 " " $7}'|sort -nr|head -n 100
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12.列出最最耗时的页面(超过60秒的)的以及对应页面发生次数
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cat access.log |awk '($NF > 60 && $7~/.php/){print $7}'|sort -n|uniq -c|sort -nr|head -n 100
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13.列出传输时间超过 30 秒的文件
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cat access.log |awk '($NF > 30){print $7}'|sort -n|uniq -c|sort -nr|head -n 20
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14.统计网站流量（G)
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cat access.log |awk '{sum+=$10} END {print sum/1024/1024/1024}'
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15.统计404的连接
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awk '($9 ~/404/)' access.log | awk '{print $9,$7}' | sort
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16. 统计http status.
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cat access.log |awk '{counts[$(9)]+=1}; END {for(code in counts) print code, counts[code]}'
cat access.log |awk '{print $9}'|sort|uniq -c|sort -rn
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17.查看是哪些爬虫在抓取内容。
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tcpdump -i eth0 -l -s 0 -w - dst port 80 | strings | grep -i user-agent | grep -i -E 'bot|crawler|slurp|spider'
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18.按域统计流量
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zcat squid_access.log.tar.gz| awk '{print $10,$7}' |awk 'BEGIN{FS="[ /]"}{trfc[$4]+=$1}END{for(domain in trfc){printf "%s %d
",domain,trfc[domain]}}'
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19.查看数据库执行的sql语句
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tcpdump -i eth0 -s 0 -l -w - dst port 3306 | strings | egrep -i 'SELECT|UPDATE|DELETE|INSERT|SET|COMMIT|ROLLBACK|CREATE|DROP|ALTER|CALL'
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20.调试命令
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strace -p pid
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21.跟踪指定进程的PID
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gdb -p pid
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22. 简单web
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python -m SimpleHTTPServer [port] //默认8000端口
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