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 $n;done
[root@oldboy C11]# cat 10_1_2.sh
#!/bin/sh
while [ 1 ]
do
uptime >>/tmp/uptime.log
usleep 2000000
done
[root@oldboy C11]# cat 10_1.sh
#!/bin/sh
while true
do
uptime
sleep 2
done
[root@oldboy C11]# cat 10_2_1.sh
#!/bin/sh
i=5
while ((i>0))
do
echo "$i"
((i--))
done
[root@oldboy C11]# cat 10_2_4.sh
#!/bin/sh
i=5
until [[ $i < 6 ]]
do
echo $i
((i--))
done
[root@oldboy C11]# cat 10_3_1.sh
#!/bin/bash
# this script is created by oldboy.
i=1
sum=0
while ((i<=100 ))
do
((sum=sum+i))
((i++))
done
[ "$sum" -ne 0 ] && printf "totalsum is: $sum\n"
[root@oldboy C11]# cat 10_3_2.sh
#!/bin/sh
i=100
((sum=i*(i+1)/2))
echo $sum
[root@oldboy C11]# cat 10_4_1.sh
#!/bin/bash
total=0
export LANG="zh_CN.UTF-8"
NUM=$((RANDOM%61))
echo "当前苹果价格是每斤$NUM元"
echo "========================"
usleep 1000000
clear
echo '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：" PRICE
expr $PRICE + 1 &>/dev/null
if [ $? -ne 0 ]
then
echo "别逗我了，快猜数字"
apple
fi
}
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(){
apple
while true
do
guess
done
}
main
[root@oldboy C11]# cat 10_5_1.sh
#!/bin/sh
export LANG="zh_CN.UTF-8"
sum=15
msg_fee=15
msg_count=0
menu(){
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 true
do
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"
esac
done
}
main
[root@oldboy C11]# cat 10_5_2.sh
#!/bin/sh
TOTAL=500
MSG_FEE=499
. /etc/init.d/functions
function 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}"
exit
fi
case "$2" in
red|RED)
echo -e "${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}"
exit
esac
}
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
charge
done
}
main
[root@oldboy C11]# cat 10_6_1.sh
#!/bin/sh
if [ $# -ne 1 ];then
echo $"usage $0 url"
exit 1
fi
while true
do
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." [email protected]
else
echo "$1 is ok"
fi
sleep 10
done
[root@oldboy C11]# cat 10_7_1.sh
#!/bin/sh
. /etc/init.d/functions
if [ $# -ne 1 ];then
echo $"usage $0 url"
exit 1
fi
while true
do
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." [email protected]
else
action "$1 is ok" /bin/true
fi
sleep 1
done
[root@oldboy C11]# cat 10_7_2.sh
#!/bin/bash
# this script is created by oldboy.
# e_mail:[email protected]
# function:case example
# version:1.3
. /etc/init.d/functions
check_count=0
url_list=(
http://blog.oldboyedu.com
http://blog.etiantian.org
http://oldboy.blog.51cto.com
http://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 1
done
echo
}
function check_url()
{
wait
for ((i=0; i<`echo ${#url_list[*]}`; i++))
do
wget -o /dev/null -T 3 --tries=1 --spider ${url_list[$i]} >/dev/null 2>&1
if [ $? -eq 0 ]
then
action "${url_list[$i]}" /bin/true
else
action "${url_list[$i]}" /bin/false
fi
done
((check_count++))
}
main(){
while true
do
check_url
echo "-------check count:${check_count}---------"
sleep 7
done
}
main
[root@oldboy C11]# cat 10_8_1.sh
#!/bin/bash
sum=0
exec <$1
while read line
do
size=`echo $line|awk '{print $10}'`
expr $size + 1 &>/dev/null
if [ $? -ne 0 ];then
continue
fi
((sum=sum+$size))
done
echo "${1}:total:${sum}bytes =`echo $((${sum}/1024))`KB"
[root@oldboy C11]# cat 10_9_1.sh
while read line
do
echo $line
done<$1
[root@oldboy C11]# cat 10_10_1.sh
file=$1
while true
do
awk '{print $1}' $1|grep -v "^$"|sort|uniq -c >/tmp/tmp.log
exec >/tmp/droplist_$(date +%F).log
fi
done
sleep 5
done
待测数据
[root@oldboy C11]# cat netstat.log
Active 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/sh
file=$1
if expr "$file" : ".*\.log" &>/dev/null
then
:
else
echo $"usage:$0 xxx.log"
exit 1
fi
while true
do
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
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 1
fi
}
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=$1
if [ `iptables -L -n|grep "$ip"|wc -l` -lt 1 ]
then
iptables -I INPUT -s $ip -j DROP
echo "$line is dropped" >>/tmp/droplist_$(date +%F).log
fi
}
main(){
JudgeExt $file
while true
do
IpCount $file
while read line
do
ip=`echo $line|awk '{print $2}'`
count=`echo $line|awk '{print $1}'`
if [ $count -gt 3 ]
then
ipt $ip
fi
done