本书历史上已出版最实战的Shell高级编程实战书籍，没有之一，和市面书籍不同，本书是作者经过18年的运维工作及教学工作后，创新类企业级实战书籍，适合所有学习及从事Linux相关工作的读者。
《跟老男孩学习Linux运维：Shell高级编程实战》第10章，本书预计于12月底出版，本章的部分代码如下：
有关代码的思路分析和详细注释，请支持作者购买正版书籍获得。
[root@oldboy C10]# for n in `ls *|sort -t"_" -n -k2`;do echo;echo;echo "[root@oldboy C11]# cat $n";cat $n;done[root@oldboy C11]# cat 10_1_2.sh#!/bin/shwhile [ 1 ] do uptime >>/tmp/uptime.log usleep 2000000done[root@oldboy C11]# cat 10_1.sh#!/bin/shwhile true do uptime sleep 2done[root@oldboy C11]# cat 10_2_1.sh#!/bin/shi=5while ((i>0)) do echo "$i" ((i--))done[root@oldboy C11]# cat 10_2_4.sh#!/bin/shi=5until [[ $i < 6 ]] do echo $i ((i--))done[root@oldboy C11]# cat 10_3_1.sh#!/bin/bash# this script is created by oldboy.i=1sum=0while ((i<=100 ))do ((sum=sum+i)) ((i++))done[ "$sum" -ne 0 ] && printf "totalsum is: $sum\n"[root@oldboy C11]# cat 10_3_2.sh#!/bin/shi=100((sum=i*(i+1)/2))echo $sum[root@oldboy C11]# cat 10_4_1.sh#!/bin/bashtotal=0export LANG="zh_CN.UTF-8"NUM=$((RANDOM%61))echo "当前苹果价格是每斤$NUM元"echo "========================"usleep 1000000clearecho '这苹果多少钱一斤啊？ 请猜0-60的数字'apple(){read -p "请输入你的价格：" PRICEexpr $PRICE + 1 &>/dev/nullif [ $? -ne 0 ] then echo "别逗我了，快猜数字" applefi}guess(){ ((total++)) if [ $PRICE -eq $NUM ] then echo "猜对了，就是$NUM元" if [ $total -le 3 ];then echo "一共猜了$total次，太牛了。" elif [ $total -gt 3 -a $total -le 6 ];then echo "一共猜了$total次，次数有点多，加油啊。" elif [ $total -gt 6 ];then echo "一共猜了$total次，行不行，猜了这多次" fi exit 0 elif [ $PRICE -gt $NUM ] then echo "嘿嘿，要不你用这个价买？" echo "再给你一次机会，请继续猜：" apple elif [ $PRICE -lt $NUM ] then echo "太低太低" echo "再给你一次机会，请继续猜：" apple fi}main(){applewhile truedo guessdone}main[root@oldboy C11]# cat 10_5_1.sh#!/bin/shexport LANG="zh_CN.UTF-8"sum=15msg_fee=15msg_count=0menu(){ cat < /dev/null if [ $? -ne 0 ] then echo "then money your input is error,must be int." else sum=$(($sum+$money)) echo "当前余额为:$sum" fi}sendInfo(){ if [ ${sum} -lt $msg_fee ] then printf "余额不足：$sum ，请充值。\n" else while true do read -p "请输入短信内容(不能有空格):" msg sum=$(($sum-$msg_fee)) printf "Send "$msg" successfully!\n" printf "当前余额为： $sum\n" if [ $sum -lt 15 ] then printf "余额不足，剩余$sum分\n" return fi done fi}main(){while truedo menu read -p "请输入数字选择：" num case "$num" in 1) recharge ;; 2) sendInfo ;; 3) exit ;; *) printf "选择错误，必须是{1|2|3}\n" esacdone}main[root@oldboy C11]# cat 10_5_2.sh#!/bin/shTOTAL=500MSG_FEE=499. /etc/init.d/functionsfunction IS_NUM(){ expr $1 + 1 &>/dev/null if [ $? -ne 0 -a "$1" != "-1" ];then return 1 fi return 0}function color(){RED_COLOR='\E[1;31m'YELLOW_COLOR='\E[1;33m'BLUE_COLOR='\E[1;34m'PINK='\E[1;35m'RES='\E[0m'if [ $# -ne 2 ];then echo "Usage $0 content {red|yellow|blue|green}" exitficase "$2" in red|RED) echo -e "${RED_COLOR}$1${RES}" ;; yellow|YELLOW) echo -e "${YELLOW_COLOR}$1${RES}" ;; green|GREEN) echo -e "${GREEN_COLOR}$1${RES}" ;; blue|BLUE) echo -e "${BLUE_COLOR}$1${RES}" ;; pink|PINK) echo -e "${PINK_COLOR}$1${RES}" ;; *) echo "Usage $0 content {red|yellow|blue|green}" exitesac}function consum(){ color "You have left $TOTAL money,Send a msg need to charge $MSG_FEE money" yellow if [ $TOTAL -lt $MSG_FEE ];then charge fi read -p "Pls input your msg:" TXT read -p "Are you to send?[y|n]" OPTION case $OPTION in [yY]|[yY][eE][sS]) color "Send "$TXT" successfully!" yellow echo $TXT >>/tmp/consum.log ((TOTAL=TOTAL-MSG_FEE)) color "Your have $TOTAL left!" yellow ;; [nN]|[nN][oO]) echo "Canceled" ;; *) echo "Invalid Input,this msg doesnt send out" ;; esac}function charge(){ if [ $TOTAL -lt $MSG_FEE ];then color "Money is not enough,Are U want to charge?[y|n]" red read OPT2 case $OPT2 in y|Y) while true do read -p "How much are you want to charge?[INT]" CHARGE IS_NUM $CHARGE&&break||{ echo "INVALID INPUT" exit 100 } done ((TOTAL+=CHARGE)) && echo "you have $TOTAL money." if [ $TOTAL -lt $MSG_FEE ];then charge fi ;; n|N) color "You have left $TOTAL money,can not send a msg,bye" red ;; *) charge ;; esac fi}main(){ while [ $TOTAL -ge $MSG_FEE ] do #color "You have left $TOTAL money" red consum chargedone}main[root@oldboy C11]# cat 10_6_1.sh#!/bin/shif [ $# -ne 1 ];then echo $"usage $0 url" exit 1fiwhile truedo if [ `curl -o /dev/null --connect-timeout 5 -s -w "%{http_code}" $1|egrep -w "200|301|302"|wc -l` -ne 1 ] then echo "$1 is error." #echo "$1 is error."|mail -s "$1 is error." 31333741--@qq.com else echo "$1 is ok" fi sleep 10done[root@oldboy C11]# cat 10_7_1.sh#!/bin/sh. /etc/init.d/functionsif [ $# -ne 1 ];then echo $"usage $0 url" exit 1fiwhile truedo if [ `curl -o /dev/null --connect-timeout 5 -s -w "%{http_code}" $1|egrep -w "200|301|302"|wc -l` -ne 1 ] then action "$1 is error." /bin/false #echo "$1 is error."|mail -s "$1 is error." 31333741--@qq.com else action "$1 is ok" /bin/true fi sleep 1done[root@oldboy C11]# cat 10_7_2.sh#!/bin/bash# this script is created by oldboy.# e_mail:31333741@qq.com# function:case example# version:1.3. /etc/init.d/functionscheck_count=0url_list=(http://blog.oldboyedu.comhttp://blog.etiantian.orghttp://oldboy.blog.51cto.comhttp://10.0.0.7)function wait(){echo -n '3秒后,执行检查URL操作.';for ((i=0;i<3;i++))do echo -n ".";sleep 1doneecho}function check_url(){waitfor ((i=0; i<`echo ${#url_list[*]}`; i++))dowget -o /dev/null -T 3 --tries=1 --spider ${url_list[$i]} >/dev/null 2>&1if [ $? -eq 0 ] then action "${url_list[$i]}" /bin/trueelse action "${url_list[$i]}" /bin/falsefidone ((check_count++))}main(){while truedo check_url echo "-------check count:${check_count}---------" sleep 7done}main[root@oldboy C11]# cat 10_8_1.sh#!/bin/bashsum=0exec <$1while read linedo size=`echo $line|awk '{print $10}'` expr $size + 1 &>/dev/null if [ $? -ne 0 ];then continue fi ((sum=sum+$size))doneecho "${1}:total:${sum}bytes =`echo $((${sum}/1024))`KB"[root@oldboy C11]# cat 10_9_1.shwhile read linedo echo $linedone<$1[root@oldboy C11]# cat 10_10_1.shfile=$1while truedo awk '{print $1}' $1|grep -v "^$"|sort|uniq -c >/tmp/tmp.log exec >/tmp/droplist_$(date +%F).log fi done sleep 5done待测数据[root@oldboy C11]# cat netstat.logActive Internet connections (servers and established)Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN tcp 0 0 115.29.49.213:80 117.136.27.254:13779 SYN_RECV tcp 0 0 115.29.49.213:80 113.97.117.157:1847 SYN_RECV tcp 0 0 115.29.49.213:80 117.136.40.20:19594 SYN_RECV tcp 0 0 115.29.49.213:80 117.136.40.20:19595 SYN_RECV tcp 0 0 115.29.49.213:80 121.236.219.69:45363 SYN_RECV tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN tcp 0 0 115.29.49.213:80 123.163.178.32:3009 ESTABLISHED tcp 0 0 115.29.49.213:80 117.136.1.202:21158 TIME_WAIT tcp 0 0 115.29.49.213:80 220.191.224.154:48550 ESTABLISHED tcp 0 0 115.29.49.213:80 183.32.61.109:5600 ESTABLISHED tcp 0 0 115.29.49.213:80 27.17.23.22:51256 FIN_WAIT2 tcp 0 0 115.29.49.213:80 218.242.161.183:50519 FIN_WAIT2 tcp 0 0 115.29.49.213:80 223.104.12.101:49900 TIME_WAIT tcp 0 0 115.29.49.213:80 140.206.64.90:62291 TIME_WAIT tcp 0 0 115.29.49.213:80 120.237.97.10:54195 ESTABLISHED tcp 0 0 115.29.49.213:80 49.80.146.230:13453 FIN_WAIT2 tcp 0 0 115.29.49.213:80 113.104.25.50:56714 FIN_WAIT2 tcp 0 0 115.29.49.213:80 101.226.89.193:41639 ESTABLISHED tcp 0 0 115.29.49.213:80 119.147.225.185:58321 TIME_WAIT tcp 0 0 115.29.49.213:80 54.183.177.237:64129 TIME_WAIT tcp 0 0 115.29.49.213:80 120.198.202.48:41960 ESTABLISHED tcp 0 1 115.29.49.213:80 119.127.188.242:38843 FIN_WAIT1 tcp 0 0 115.29.49.213:34081 223.4.9.70:80 TIME_WAIT tcp 0 0 115.29.49.213:80 58.223.4.14:46716 FIN_WAIT2 tcp 0 0 115.29.49.213:80 122.90.74.255:12177 FIN_WAIT2 tcp 0 0 115.29.49.213:80 59.53.166.165:62253 ESTABLISHED tcp 0 0 115.29.49.213:80 219.133.40.13:34113 ESTABLISHED tcp 0 0 115.29.49.213:80 222.175.140.230:29902 TIME_WAIT tcp 0 0 115.29.49.213:80 54.77.101.105:49967 TIME_WAIT tcp 0 0 115.29.49.213:80 54.207.37.100:63364 TIME_WAIT tcp 0 0 115.29.49.213:80 125.118.62.149:61840 FIN_WAIT2 tcp 0 0 115.29.49.213:80 112.117.173.124:50367 ESTABLISHED tcp 0 0 115.29.49.213:80 120.194.52.156:2752 FIN_WAIT2 tcp 0 0 115.29.49.213:80 114.106.68.5:54231 ESTABLISHED tcp 0 0 115.29.49.213:80 27.154.82.136:3013 FIN_WAIT2 tcp 0 0 115.29.49.213:80 182.245.82.46:55306 FIN_WAIT2 tcp 0 0 115.29.49.213:80 117.92.15.157:29926 TIME_WAIT tcp 0 0 115.29.49.213:80 163.179.63.118:62371 ESTABLISHED tcp 0 777 115.29.49.213:80 106.59.15.116:1673 ESTABLISHED tcp 0 777 115.29.49.213:80 117.22.215.8:1382 ESTABLISHED tcp 0 0 115.29.49.213:80 114.217.182.123:51960 TIME_WAIT tcp 0 0 115.29.49.213:80 118.242.18.177:24615 ESTABLISHED tcp 0 0 115.29.49.213:80 220.191.224.154:23380 TIME_WAIT tcp 0 0 115.29.49.213:80 119.78.240.118:59230 FIN_WAIT2 tcp 0 0 115.29.49.213:80 218.83.11.138:52739 TIME_WAIT tcp 0 0 115.29.49.213:80 122.70.113.17:57809 TIME_WAIT tcp 0 0 115.29.49.213:80 121.235.160.76:2487 TIME_WAIT tcp 0 0 115.29.49.213:80 111.175.68.97:49920 TIME_WAIT tcp 0 1 115.29.49.213:80 221.137.78.206:54593 FIN_WAIT1 tcp 0 0 115.29.49.213:80 119.121.180.245:14524 TIME_WAIT tcp 0 0 115.29.49.213:80 123.151.42.52:55816 ESTABLISHED tcp 0 0 115.29.49.213:80 120.192.146.19:26133 FIN_WAIT2 tcp 0 0 115.29.49.213:80 113.107.56.233:45496 TIME_WAIT tcp 0 1 115.29.49.213:80 119.249.255.140:1664 FIN_WAIT1 tcp 0 0 115.29.49.213:80 222.132.131.91:5451 ESTABLISHED tcp 0 0 115.29.49.213:80 183.32.61.109:5712 FIN_WAIT2 tcp 0 52 115.29.49.213:22 119.2.28.4:13185 ESTABLISHED tcp 0 0 115.29.49.213:80 221.179.140.171:48647 TIME_WAIT tcp 0 0 115.29.49.213:80 111.161.61.49:60865 ESTABLISHED tcp 0 0 115.29.49.213:80 58.247.119.17:64369 TIME_WAIT tcp 0 0 115.29.49.213:80 121.35.208.125:50139 FIN_WAIT2 tcp 0 0 115.29.49.213:80 118.242.18.177:24619 ESTABLISHED tcp 0 0 115.29.49.213:80 111.17.45.226:5492 TIME_WAIT tcp 0 0 115.29.49.213:80 114.250.252.127:50802 TIME_WAIT tcp 0 0 115.29.49.213:80 49.80.146.230:13424 TIME_WAIT tcp 0 0 115.29.49.213:80 113.241.77.56:18509 TIME_WAIT tcp 0 0 115.29.49.213:80 101.226.61.186:57302 ESTABLISHED tcp 0 0 115.29.49.213:80 59.38.233.215:18224 FIN_WAIT2 tcp 0 0 115.29.49.213:80 222.70.73.234:52968 FIN_WAIT2 tcp 0 0 115.29.49.213:80 114.100.142.6:3171 TIME_WAIT tcp 0 0 115.29.49.213:80 27.18.159.160:50095 TIME_WAIT tcp 0 0 115.29.49.213:80 122.64.91.155:35708 ESTABLISHED tcp 0 0 115.29.49.213:80 116.90.81.14:52978 TIME_WAIT tcp 0 0 115.29.49.213:80 124.227.212.140:38460 ESTABLISHED tcp 0 0 115.29.49.213:80 223.242.103.128:3997 TIME_WAIT tcp 0 0 115.29.49.213:80 113.116.147.94:50073 ESTABLISHED tcp 0 0 115.29.49.213:80 112.117.173.124:50366 TIME_WAIT tcp 0 0 115.29.49.213:80 122.227.191.174:4833 FIN_WAIT2 tcp 0 0 115.29.49.213:80 42.95.73.152:51472 ESTABLISHED tcp 0 0 115.29.49.213:80 58.215.136.140:56794 TIME_WAIT tcp 0 0 115.29.49.213:80 116.90.81.14:52974 TIME_WAIT tcp 0 0 115.29.49.213:80 223.100.156.53:59779 TIME_WAIT tcp 0 0 115.29.49.213:80 125.112.122.240:44893 FIN_WAIT2 tcp 0 0 115.29.49.213:80 14.211.169.36:26342 TIME_WAIT tcp 0 0 115.29.49.213:80 114.250.252.127:50809 TIME_WAIT tcp 0 0 115.29.49.213:80 14.157.228.55:3184 FIN_WAIT2 tcp 0 0 115.29.49.213:80 112.113.160.225:3029 TIME_WAIT tcp 0 0 115.29.49.213:80 14.17.11.196:33403 ESTABLISHED tcp 0 0 115.29.49.213:80 36.249.78.78:2615 FIN_WAIT2 tcp 0 0 115.29.49.213:80 114.105.192.151:1312 ESTABLISHED tcp 0 0 115.29.49.213:80 118.242.18.177:24616 FIN_WAIT2 tcp 0 0 115.29.49.213:80 27.191.14.232:50272 FIN_WAIT2 tcp 0 0 115.29.49.213:80 119.187.139.167:1779 FIN_WAIT2 tcp 0 0 115.29.49.213:80 218.75.147.14:5195 TIME_WAIT tcp 0 0 115.29.49.213:80 1.204.201.226:12694 ESTABLISHED [root@oldboy C11]# cat 10_10_2.sh#!/bin/shfile=$1if expr "$file" : ".*\.log" &>/dev/null then : else echo $"usage:$0 xxx.log" exit 1fiwhile truedogrep "ESTABLISHED" $1|awk -F "[ :]+" '{ ++S[$(NF-3)]}END {for(key in S) print S[key], key}'|sort -rn -k1|head -5 >/tmp/tmp.log while read line do ip=`echo $line|awk '{print $2}'` count=`echo $line|awk '{print $1}'` if [ $count -gt 3 ] && [ `iptables -L -n|grep "$ip"|wc -l` -lt 1 ] then iptables -I INPUT -s $ip -j DROP echo "$line is dropped" >>/tmp/droplist_$(date +%F).log fi done/dev/null then : else echo $"usage:$0 xxx.log" exit 1fi}IpCount(){grep "ESTABLISHED" $1|awk -F "[ :]+" '{ ++S[$(NF-3)]}END {for(key in S) print S[key], key}'|sort -rn -k1|head -5 >/tmp/tmp.log}ipt(){local ip=$1if [ `iptables -L -n|grep "$ip"|wc -l` -lt 1 ]then iptables -I INPUT -s $ip -j DROP echo "$line is dropped" >>/tmp/droplist_$(date +%F).logfi}main(){JudgeExt $filewhile truedoIpCount $filewhile read line do ip=`echo $line|awk '{print $2}'` count=`echo $line|awk '{print $1}'` if [ $count -gt 3 ] then ipt $ip fi done