Shell编程牛客网和Leetcode

2022-07-18 19:33:21 阅读：196 来源： 互联网

标签：Shell 0.0 45.0 nowcoder 牛客 2020 172.16 txt Leetcode

shell部分的练习在牛客网有34题，在Leetcode有4题，总体来说难度不大，熟练就好。

牛客部分：

1.统计文件行数

写一个 bash脚本以输出一个文本文件 nowcoder.txt中的行数
示例:
假设 nowcoder.txt 内容如下：

#include <iostream>
using namespace std;
int main()
{
    int a = 10;
    int b = 100;
    cout << "a + b:" << a + b << endl;
    return 0;
}

你的脚本应当输出：
9

#!/bin/bash
# basic
方法1 cat nowcoder.txt | wc -l
# grep
方法2 grep -c '.*' nowcoder.txt
方法3 grep -c '' nowcoder.txt
# sed
方法4 sed -n '$=' nowcoder.txt
# awk
方法5 awk '/.*/{i++}END{print i}' nowcoder.txt
方法6 awk '//{i++}END{print i}' nowcoder.txt
方法7 awk 'END{print NR}' nowcoder.txt 
方法8 awk '{print NR}' nowcoder.txt | tail -n1
方法9 awk '//' nowcoder.txt | wc -l
方法10 awk -F: '/.*/' nowcoder.txt | wc -l

2.打印文件的最后5行

描述

经常查看日志的时候，会从文件的末尾往前查看，于是请你写一个 bash脚本以输出一个文本文件 nowcoder.txt中的最后5行
示例:
假设 nowcoder.txt 内容如下：

#include<iostream>
using namespace std;
int main()
{
int a = 10;
int b = 100;
cout << "a + b:" << a + b << endl;
return 0;
}

你的脚本应当输出：

int a = 10;
int b = 100;
cout << "a + b:" << a + b << endl;
return 0;
}

# basic
方法1 cat nowcoder.txt | tail -n5
方法2 tail -n5 nowcoder.txt
# awk
方法3 awk -F: 'BEGIN{i=1}{arg[i]=$0;i++}END{for(j=NR-4;j<=NR;j++)print arg[j]}'

3.输出7的倍数

描述

写一个 bash脚本以输出数字 0 到 500 中 7 的倍数(0 7 14 21...)的命令

#!/bin/bash
# basic
方法1 seq 0 7 500
# for((i=0;i<=500;i++))
# do
#     if(($i%7==0))
#         then 
#         echo $i
#     fi
# done
方法2 sum=0
# while [ $sum -le 500 ]
# do
#     echo $sum
#     sum=$[$sum+7]
# done
方法3 awk
awk -F: 'BEGIN{
for(i=0;i<=500;i++)
    if(i%7==0)
        print i
}'

4.输出第5行的内容

描述

写一个 bash脚本以输出一个文本文件 nowcoder.txt 中第5行的内容。

示例:
假设 nowcoder.txt 内容如下：
welcome
to
nowcoder
this
is
shell
code

你的脚本应当输出：
is

#!/bin/bash
# basic
方法1 head -n5 nowcoder.txt | tail -n1
方法2 i=1
# for j in `cat nowcoder.txt`
# do
#     if [[ $i -eq 5 ]]
#         then
#             echo $j
#     fi
#     i=$[$i+1]
# done
方法3 i=1
while read p
do
    if [[ $i -eq 5 ]]
        then
            echo $p
    fi
    i=$[$i+1]
done < nowcoder.txt
# sed
方法4 sed -n '5p' nowcoder.txt
# awk
方法5 awk -F: 'NR==5{print $0}' nowcoder.txt

5.打印空行的行号

描述

写一个 bash脚本以输出一个文本文件 nowcoder.txt中空行的行号,可能连续,从1开始

示例:
假设 nowcoder.txt 内容如下：

a
b

c

d

e


f

你的脚本应当输出：
3
5
7
9
10

#!/bin/bash
# basic
方法1 i=1
# while read p
# do
#     if [[ $p == '' ]]
#         then 
#         echo $i
#     fi
#     i=$[$i+1]
# done < nowcoder.txt
# grep
方法2 grep -n '^$' nowcoder.txt | awk -F: '{print $1}'
方法3 grep -n '^$' nowcoder.txt | sed 's#:##g'
# sed
方法4 sed -n '/^$/=' nowcoder.txt
# awk
方法5 awk -F: '$0=="" {print NR}' nowcoder.txt
方法6 awk -F: '/^$/ {print NR}' nowcoder.txt
方法7 awk -F: '{if($0=="") {print NR}}' nowcoder.txt

6.去掉空行

描述

写一个 bash脚本以去掉一个文本文件 nowcoder.txt中的空行
示例:
假设 nowcoder.txt 内容如下：

abc

567


aaa
bbb



ccc

你的脚本应当输出：
abc
567
aaa
bbb
ccc

#!/bin/bash
# basic
方法1 while read p
# do
#     if [[ $p == '' ]]
#         then 
#         continue
#     fi
#     echo $p
# done < nowcoder.txt
方法2 for i in `cat nowcoder.txt`
# do
#     echo $i
# done
方法3 cat nowcoder.txt | awk NF
方法4 cat nowcoder.txt | awk -F: '{if($0!="") {print $0}}'
方法5 cat nowcoder.txt | awk -F: '!/^$/ {print $0}' 
# grep
方法6 grep -v '^$' nowcoder.txt
方法7 grep -E '[a-zA-Z0-9]+' nowcoder.txt
# sed
方法8 sed -r '/^$/d' nowcoder.txt
方法9 sed -nr '/^$/!p' nowcoder.txt
# awk
方法10 awk NF nowcoder.txt
方法11 awk -F: '{if($0!="") {print $0}}' nowcoder.txt
方法12 awk -F: '!/^$/ {print $0}' nowcoder.txt

7.打印字母数小于8的单词

描述

写一个 bash脚本以统计一个文本文件 nowcoder.txt中字母数小于8的单词。

示例:
假设 nowcoder.txt 内容如下：
how they are implemented and applied in computer

你的脚本应当输出：
how
they
are

and applied

in

说明:
不要担心你输出的空格以及换行的问题

#!/bin/bash
# basic
方法1 for p in `cat nowcoder.txt`
# do
#     if [[ $(echo $p | wc -L) -lt 8 ]]
#         then
#             echo $p
#     fi
# done 
方法2 for p in `cat nowcoder.txt`
# do
#     if [[ $(echo $p | wc -m) -lt 9 ]]
#         then
#             echo $p
#     fi
# done 
方法3 for p in `cat nowcoder.txt`
# do
#     if [[ ${#p} -lt 8 ]]
#         then
#             echo $p
#     fi
# done 
方法4 cat nowcoder.txt | xargs -n1 | while read p
do
    if [[ ${#p} -lt 8 ]]
        then echo $p
    fi
done
#awk
方法5 awk '{for(i=1;i<=NF;i++) if(length($i)<8) print $i}' nowcoder.txt

8.统计所有进程占用内存大小的和

描述

假设 nowcoder.txt 内容如下：
root 2 0.0 0.0 0 0 ? S 9月25 0:00 [kthreadd]
root 4 0.0 0.0 0 0 ? I< 9月25 0:00 [kworker/0:0H]
web 1638 1.8 1.8 6311352 612400 ? Sl 10月16 21:52 test
web 1639 2.0 1.8 6311352 612401 ? Sl 10月16 21:52 test
tangmiao-pc 5336 0.0 1.4 9100240 238544 ?? S 3:09下午 0:31.70 /Applications

以上内容是通过ps aux | grep -v 'RSS TTY' 命令输出到nowcoder.txt文件下面的
请你写一个脚本计算一下所有进程占用内存大小的和:

#!/bin/bash
# awk
方法1 awk -F" " '{sum=sum+$6}END{print sum}' nowcoder.txt
方法2 awk -F" " 'BEGIN{sum=0}{sum=sum+$6}END{print sum}' nowcoder.txt
方法3 awk 'BEGIN{sum=0}{sum=sum+$6}END{print sum}' nowcoder.txt

9.统计每个单词出现的个数

描述

写一个 bash脚本以统计一个文本文件 nowcoder.txt 中每个单词出现的个数。

为了简单起见，你可以假设：
nowcoder.txt只包括小写字母和空格。
每个单词只由小写字母组成。
单词间由一个或多个空格字符分隔。

示例:
假设 nowcoder.txt 内容如下：
welcome nowcoder
welcome to nowcoder
nowcoder
你的脚本应当输出（以词频升序排列）：
to 1
welcome 2
nowcoder 3

说明:
不要担心个数相同的单词的排序问题，每个单词出现的个数都是唯一的。

#!/bin/bash
#awk
awk -F" " '{for(i=1;i<=NF;i++){arr[$i]++}}END{for(j in arr)print j, arr[j]}' nowcoder.txt | sort -nk2

10.第二列是否有重复

描述

给定一个 nowcoder.txt文件，其中有3列信息，如下实例，编写一个shell脚本来检查文件第二列是否有重复，且有几个重复，并提取出重复的行的第二列信息：
实例：
20201001 python 99
20201002 go 80
20201002 c++ 88
20201003 php 77
20201001 go 88
20201005 shell 89
20201006 java 70
20201008 c 100
20201007 java 88
20201006 go 97

结果：
2 java
3 go

#!/bin/bash
# awk
awk -F" " '{array[$2]++}END{
    for(i in array)
        if(array[i] > 1)
            print array[i], i}' nowcoder.txt

11.转置文件的内容

描述

写一个 bash脚本来转置文本文件nowcoder.txt中的文件内容。

为了简单起见，你可以假设：
你可以假设每行列数相同，并且每个字段由空格分隔

示例:
假设 nowcoder.txt 内容如下：
job salary
c++ 13
java 14
php 12

你的脚本应当输出（以词频升序排列）：
job c++ java php
salary 13 14 12

#!/bin/bash
#awk
# awk '{print $1}' nowcoder.txt
# awk '{print $2}' nowcoder.txt
awk -F " " '{for(i=1;i<=NF;i++){
    if(NR==1){
        array[i]=$i
    }else{
        array[i]=array[i] $i
    }
}}END{
    for(j=1;j<=NF;j++){
        print array[j]
    }
}' nowcoder.txt

12.打印每一行出现的数字个数

描述

写一个 bash脚本以统计一个文本文件 nowcoder.txt中每一行出现的1,2,3,4,5数字个数并且要计算一下整个文档中一共出现了几个1,2,3,4,5数字数字总数。

示例:
假设 nowcoder.txt 内容如下：
a12b8
10ccc
2521abc
9asf
你的脚本应当输出：
line1 number: 2
line2 number: 1
line3 number: 4
line4 number: 0
sum is 7

说明:
不要担心你输出的空格以及换行的问题

#!/bin/bash
#basic
方法1 cnt=1
# sum=0
# while read p
# do
#     a=`echo $p | grep -oE "[1-5]" | wc -l`
#     echo line$cnt number:$a
#     cnt=$[$cnt+1]
#     sum=$[$sum+$a]
# done 
# echo sum is $sum
# < nowcoder.txt
方法2 cnt=1
# sum=0
# while read p
# do
#     a=`echo $p | sed 's#[a-Z|6-9|0]##g' | awk '{print length($0)}'`
#     echo line$cnt number:$a
#     cnt=$[$cnt+1]
#     sum=$[$sum+$a]
# done 
# echo sum is $sum
# < nowcoder.txt

# awk
方法3 awk '{
gsub(/[^1-5]/,"",$0)
print "line"NR" number: "length($0)
sum+=length($0)
}END{print "sum is "sum}' nowcoder.txt

13.去掉所有包含this的句子

描述

写一个 bash脚本以实现一个需求，去掉输入中含有this的语句，把不含this的语句输出
示例:
假设输入如下：
that is your bag
is this your bag?
to the degree or extent indicated.
there was a court case resulting from this incident
welcome to nowcoder

你的脚本获取以上输入应当输出： that is your bag

to the degree or extent indicated.
welcome to nowcoder

说明:
你可以不用在意输出的格式，包括空格和换行

#!/bin/bash
# grep
方法1 grep -v 'this' nowcoder.txt
# sed
方法2 sed '/this/d' nowcoder.txt
方法3 sed -rn '/this/!p' nowcoder.txt
# awk
方法4 awk '!/this/' nowcoder.txt
方法5 awk '{
# a=split($0, array, " ")
# }{for(i=1;i<=a;i++){
#     if(array[i]=="this"){
#         next
#     }
# }{print $0}}' nowcoder.txt

方法6 awk '{
j=0
for(i=1;i<=NF;i++){
    if($i=="this"){
        j+=1
    }
}
if(j==0){
    print $0
}
}' nowcoder.txt

14.求平均值

描述

写一个bash脚本以实现一个需求，求输入的一个的数组的平均值

第1行为输入的数组长度N
第2~N行为数组的元素，如以下为:
数组长度为4，数组元素为1 2 9 8
示例:
4
1
2
9
8

那么平均值为:5.000(保留小数点后面3位)
你的脚本获取以上输入应当输出：
5.000

#!/bin/bash
# basic
方法1 sum=0
# num=0
# while read p
# do
#     if [[ $num -eq 0 ]]
#         then 
#         num=$[$num+1]
#         continue
#     fi
#     sum=$[$sum+$p]
#     num=$[$num+1]

# done < nowcoder.txt
# echo "scale=3;$sum/$[$num-1]" | bc
# awk
方法2 awk '{if(NR!=1)
#         sum+=$0
#     else num+=$0}END{printf "%.3f",sum/num}' nowcoder.txt

15.去掉不需要的单词

描述

写一个 bash脚本以实现一个需求，去掉输入中的含有B和b的单词
示例:
假设输入如下：
big
nowcoder
Betty
basic
test

你的脚本获取以上输入应当输出：
nowcoder test

说明:
你可以不用在意输出的格式，空格和换行都行

#!/bin/bash
方法1 cnt=1
# sum=0
# while read p
# do
#     a=`echo $p | sed 's#[a-Z|6-9|0]##g' | awk '{print length($0)}'`
#     echo line$cnt number:$a
#     cnt=$[$cnt+1]
#     sum=$[$sum+$a]
# done 
# echo sum is $sum
# < nowcoder.txt
# grep
方法2 grep -v 'this' nowcoder.txt
# sed
方法3 sed '/this/d' nowcoder.txt
方法4 sed -rn '/this/!p' nowcoder.txt
# awk
方法5 awk '!/this/' nowcoder.txt
方法6 awk '{
# a=split($0, array, " ")
# }{for(i=1;i<=a;i++){
#     if(array[i]=="this"){
#         next
#     }
# }{print $0}}' nowcoder.txt


方法7 awk '{
# j=0
# for(i=1;i<=NF;i++){
#     if($i=="this"){
#         j+=1
#     }
# }
# if(j==0){
#     print $0
# }
# }' nowcoder.txt



# grep
方法8 grep -v '[bB]' nowcoder.txt
方法9 grep -v -E 'b|B' nowcoder.txt

# sed
方法10 sed '/[b,B]/d' nowcoder.txt
方法11 sed -nr '/[b,B]/!p' nowcoder.txt
# awk
方法12 awk '!/[b,B]/' nowcoder.txt
方法13 awk '$0!~/[b,B]/{print $0}' nowcoder.txt

16.判断输入的是否为IP地址

描述

写一个脚本统计文件nowcoder.txt中的每一行是否是正确的IP地址。如果是正确的IP地址输出：yes 如果是错误的IP地址，四段号码的话输出：no，否则的话输出：error 假设nowcoder.txt内容如下

192.168.1.1
192.168.1.0
300.0.0.0
123

你的脚本应该输出

yes yes no error

#!/bin/bash
# awk
awk -F"." '{
if(NF!=4) print("error")
else{
    info="yes"
    for(i=1;i<=NF;i++){
        if($i<0||$i>255){
            info="no"
            break
        }
    }
    print(info)
    }
}' nowcoder.txt
17.将字段逆序输出文件的每行

描述
将字段逆序输出文件nowcoder.txt的每一行，其中每一字段都是用英文冒号: 相分隔。假设nowcoder.txt内容如下：
nobody:*:-2:-2:Unprivileged User:/var/empty:/usr/bin/false root:*:0:0:System Administrator:/var/root:/bin/sh
你的脚本应当输出
/usr/bin/false:/var/empty:Unprivileged User:-2:-2:*:nobody /bin/sh:/var/root:System Administrator:0:0:*:root
#!/bin/bash
# awk
方法1 awk -F: -vOFS=: '{print $NF,$6,$5,$4,$3,$2,$1}' nowcoder.txt
# awk -F: '{
# for(i=NF;i>=1;i--){
#     if(i==1){
#         print $i
#         break
#     }
#     printf("%s",$i ":") 
# }
# }' nowcoder.txt
方法2 awk -F: '{
for(i=1;i<=NF;i++){
    array[NF+1-i]=$i
}
for(j in array){
    if(j==NF){
        printf("%s",array[j] "\n")
    }else{
        printf("%s", array[j] ":")
    }
}

}' nowcoder.txt
18.域名进行计数排序处理

描述
假设我们有一些域名，存储在nowcoder.txt里，现在需要你写一个脚本，将域名取出并根据域名进行计数排序处理。假设nowcoder.txt内容如下：
http://www.nowcoder.com/index.html http://www.nowcoder.com/1.html http://m.nowcoder.com/index.html
你的脚本应该输出：
2 www.nowcoder.com 1 m.nowcoder.com
#!/bin/bash
# awk
awk -F"[//]+" '{array[$2]+=1}END{for(i in array){print array[i],i}}' nowcoder.txt | sort -rnk 1
19.打印等腰三角形

描述
打印边长为5的等腰三角形。你的脚本应该输出
*
* *
* * *
* * * *
* * * * *
#!/bin/bash
# basic
方法1 echo "    *"
# echo "   * *"
# echo "  * * *"
# echo " * * * *"
# echo "* * * * *"
方法2 for (( i=1;i<=5;i++ )) 
# do
#     for (( j=5-i;j>0;j-- ))
#         do
#             printf " "
#         done
#         for(( k=i;k>0;k-- ))
#             do
#                 printf "* "
#             done
#     printf "\n"
# done
# awk
方法3 awk 'BEGIN{for(i=1;i<=5;i++){
for(j=5-i;j>0;j--){
    printf(" ")
}
for(k=i;k>0;k--){
    printf("* ")
}
printf("\n")
}}'
20.打印只有一个数字的行

描述
假设我们有一个nowcoder.txt，现在需要你写脚本，打印只有一个数字的行。假设nowcoder.txt内容如下
haha 1 2ab cd 77
那么你的脚本应该输出
1 2ab
#!/bin/bash
# basic
方法1 while read p
# do
#     num=`echo $p | grep -oE "[0-9]" | wc -l`
#     if [ $num -eq 1 ]
#         then
#         echo $p
#     fi
# done < nowcoder.txt

方法2 while read p
do
    num=`echo $p | sed 's#[^0-9]##g' | awk '{print length($0)}'`
    if [ $num -eq 1 ]
        then
        echo $p
    fi
done < nowcoder.txt

方法3 cnt=1
# sum=0
# while read p
# do
#     a=`echo $p | grep -oE "[1-5]" | wc -l`
#     echo line$cnt number:$a
#     cnt=$[$cnt+1]
#     sum=$[$sum+$a]
# done 
# echo sum is $sum
# < nowcoder.txt
方法4 cnt=1
# sum=0
# while read p
# do
#     a=`echo $p | sed 's#[a-Z|6-9|0]##g' | awk '{print length($0)}'`
#     echo line$cnt number:$a
#     cnt=$[$cnt+1]
#     sum=$[$sum+$a]
# done 
# echo sum is $sum
# < nowcoder.txt

# awk
方法5 awk '{
# gsub(/[^1-5]/,"",$0)
# print "line"NR" number: "length($0)
# sum+=length($0)
# }END{print "sum is "sum}' nowcoder.txt
21.格式化输出

描述
我们有一个文件nowcoder.txt，里面的每一行都是一个数字串，假设数字串为“123456789”，那么我们要输出为123,456,789。假设nowcoder.txt内容如下
1 12 123 1234 123456
那么你的脚本输出如下
1 12 123 1,234 123,456
#!/bin/bash
# basic
方法1 while read p
# do
#     # 连续数字个数
#     c=0
#     # 数字的总个数
#     num=`echo $p | grep -oE '[0-9]' | wc -l`
#     # 输出结果
#     str=""
#     for(( i=$num-1;i>=0;i-- ))
#         do
#             # 计算需要截断的位置
#             c=$[ $c+1 ]
#             # 一个一个取数字，从后往前
#             str="${p:$i:1}$str"
#             # 数据长度大于3,指针没到底,计数器为3
#             if [ $num -gt 3 ] && [ $i -gt 0 ] && [ $[ $c % 3 ] -eq 0 ] 
#                 then 
#                 str=",$str"
#             fi
#         done
#     echo ${str}
# done < nowcoder.txt
方法2 while read p
do
    printf "%'d\n" $p
done

方法3 while read p
# do
#     printf "%'.f\n" $p
# done
22.处理文本

描述
假设我们有一个nowcoder.txt，假设里面的内容如下
111:13443 222:13211 111:13643 333:12341 222:12123
现在需要你写一个脚本按照以下的格式输出
[111] 13443 13643 [222] 13211 12123 [333] 12341
#!/bin/bash
# awk
awk -F":" '{
array[$1]=array[$1] "\n" $2
}END{for(i in array){
print("["i"]", array[i])
}}' nowcoder.txt
23.nginx日志分析1-IP统计

描述
假设nginx的日志我们存储在nowcoder.txt里，格式如下：
192.168.1.20 - - [21/Apr/2020:14:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.21 - - [21/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.22 - - [21/Apr/2020:21:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.23 - - [21/Apr/2020:22:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.24 - - [22/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.25 - - [22/Apr/2020:15:26:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.20 - - [23/Apr/2020:08:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.21 - - [23/Apr/2020:09:20:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.20 - - [23/Apr/2020:14:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.21 - - [23/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.22 - - [23/Apr/2020:15:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.25 - - [23/Apr/2020:16:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.24 - - [23/Apr/2020:20:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.25 - - [23/Apr/2020:20:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.20 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.21 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.22 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.22 - - [23/Apr/2020:15:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0" 192.168.1.21 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
现在需要你统计出2020年4月23号的访问ip次数，并且按照次数降序排序。你的脚本应该输出：
5 192.168.1.22 4 192.168.1.21 3 192.168.1.20 2 192.168.1.25 1 192.168.1.24
#!/bin/bash
# grep
方法1 grep "23/Apr/2020" nowcoder.txt | awk -F " " '{array[$1]++}END{for(i in array){print array[i],i}}' | sort -rnk 1
方法2 grep "23/Apr/2020" nowcoder.txt | cut -c '-12' | sort | uniq -c | sort -rnk 1 | sed 's#^ *##'
方法3 grep "23/Apr/2020" nowcoder.txt | awk -F " " '{print $1}' | sort | uniq -c | sort -rnk 1 | sed 's#^ *##'
方法4 grep "23/Apr/2020" nowcoder.txt | awk -F " " '{print $1}' | sort | uniq -c | sort -rnk 1 
方法5 grep "23/Apr/2020" nowcoder.txt | awk -F " " '{print $1}' | sort | uniq -c | sort -rnk 1 | awk '{print $1,$2}'
# sed
方法6 sed -n '/\[23\/Apr\/2020/p' | awk -F " " '{print $1}' | sort | uniq -c | sort -rnk 1 | awk '{print $1,$2}'
方法7 sed -n '/\[23\/Apr\/2020/p' | awk -F " " '{print $1}' | sort | uniq -c | sort -rnk 1 | sed 's#^ *##'
# awk
方法8 awk -F " " '$4~/\[23\/Apr\/2020/ {
# array[$1]++
# }END{
# for(i in array){
# print array[i], i
# }
# }' nowcoder.txt | sort -rnk 1
24.nginx日志分析2-统计某个时间段的IP

描述
假设nginx的日志我们存储在nowcoder.txt里，格式如下：
192.168.1.20 - - [21/Apr/2020:14:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [21/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [21/Apr/2020:21:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.23 - - [21/Apr/2020:22:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [22/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [22/Apr/2020:15:26:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:08:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:09:20:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:14:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:15:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [23/Apr/2020:16:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [23/Apr/2020:20:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [23/Apr/2020:20:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:22:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:23:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
现在你需要统计2020年04月23日20-23点的去重IP访问量，你的脚本应该输出 5
#!/bin/bash
# grep
方法1 grep -E '23/Apr/2020:2[0-2]' nowcoder.txt | awk -F " " '{print $1}' | sort | uniq -c | wc -l
# sed 
方法2 sed -n '/\[23\/Apr\/2020\:20/,/\[23\/Apr\/2020\:23/p' nowcoder.txt | awk -F " " '{print $1}' | sort | uniq -c | wc -l 
# awk
方法3 awk -F " " '$4~/\[23\/Apr\/2020\:2[0-3]/' nowcoder.txt | awk '{print $1}' | sort | uniq -c | wc -l
25.nginx日志分析3-统计访问3次以上的IP

描述
假设nginx的日志我们存储在nowcoder.txt里，格式如下：
192.168.1.20 - - [21/Apr/2020:14:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [21/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [21/Apr/2020:21:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.23 - - [21/Apr/2020:22:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [22/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [22/Apr/2020:15:26:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:08:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:09:20:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:14:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:15:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [23/Apr/2020:16:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [23/Apr/2020:20:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [23/Apr/2020:20:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:22:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:23:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"

现在需要你写脚本统计访问3次以上的IP，你的脚本应该输出
6 192.168.1.22
5 192.168.1.21
4 192.168.1.20
#!/bin/bash
# awk
awk -F " " '{array[$1]++}END{for(i in array){
if(array[i] > 3){
print(array[i], i)
}
}}' nowcoder.txt | sort -rnk 1
26.nginx日志分析4-查询某个IP的详细访问情况

描述
假设nginx的日志我们存储在nowcoder.txt里，格式如下：
192.168.1.20 - - [21/Apr/2020:14:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [21/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [21/Apr/2020:21:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.23 - - [21/Apr/2020:22:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [22/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [22/Apr/2020:15:26:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:08:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:09:20:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:14:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:15:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:15:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [23/Apr/2020:16:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [23/Apr/2020:20:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [23/Apr/2020:20:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:22:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:23:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
现在需要你查询192.168.1.22的详细访问情况，按访问频率降序排序。你的脚本应该输出
4 /1/index.php 2 /3/index.php
#!/bin/bash
# grep
方法1 grep '192.168.1.22' nowcoder.txt | awk -F " " '{array[$7]++}END{for(i in array){
# print(array[i],i)
# }}' | sort -rnk 1
# sed
方法2 sed -n '/192.168.1.22/p' nowcoder.txt | awk -F " " '{array[$7]++}END{for(i in array){
print(array[i],i)
}}' | sort -rnk 1
# awk
方法3 awk -F " " '$1~/192.168.1.22/{array[$7]++}END{for(i in array){
# print(array[i], i)
# }}' nowcoder.txt | sort -rnk 1
27.nginx日志分析5-统计爬虫抓取404的次数

描述
假设nginx的日志我们存储在nowcoder.txt里，格式如下：
192.168.1.20 - - [21/Apr/2020:14:12:49 +0800] "GET /1/index.php HTTP/1.1" 301 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [21/Apr/2020:15:00:49 +0800] "GET /2/index.php HTTP/1.1" 500 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [21/Apr/2020:21:21:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.23 - - [21/Apr/2020:22:10:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [22/Apr/2020:15:00:49 +0800] "GET /2/index.php HTTP/1.1" 200 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [22/Apr/2020:15:26:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:08:05:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"
192.168.1.21 - - [23/Apr/2020:09:20:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 200 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:14:12:49 +0800] "GET /1/index.php HTTP/1.1" 200 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:15:00:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:15:00:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"
192.168.1.22 - - [23/Apr/2020:15:00:49 +0800] "GET /3/index.php HTTP/1.1" 200 490 "-" "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"
192.168.1.24 - - [23/Apr/2020:20:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [23/Apr/2020:20:27:49 +0800] "GET /3/index.php HTTP/1.1" 200 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 300 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 500 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:22:10:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:23:59:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
现在需要你统计百度爬虫抓取404的次数，你的脚本应该输出 2
#!/bin/bash
# grep
方法1 grep 'http://www.baidu.com/search/spider.html' nowcoder.txt | grep '404' | wc -l
# awk
方法2 count=0
# sed
方法3 sed -rn '/.*404.*http\:\/\/www\.baidu\.com\/search\/spider\.html.*/p' nowcoder.txt | wc -l
方法4 awk -F " " '{
# if($15 ~ "http://www.baidu.com/search/spider.html" && $9 ~ "404"){
# count++
# }
# }
# END{
# print(count)
# }' nowcoder.txt
28.nginx日志分析6-统计每分钟的请求数

描述
假设nginx的日志我们存储在nowcoder.txt里，格式如下：
192.168.1.20 - - [21/Apr/2020:14:12:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [21/Apr/2020:15:00:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [21/Apr/2020:21:21:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.23 - - [21/Apr/2020:22:10:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [22/Apr/2020:15:00:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [22/Apr/2020:15:26:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:08:05:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Baiduspider"
192.168.1.21 - - [23/Apr/2020:09:20:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:10:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:14:12:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:15:00:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:15:00:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Baiduspider"
192.168.1.25 - - [23/Apr/2020:16:15:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.24 - - [23/Apr/2020:20:27:49 +0800] "GET /2/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.25 - - [23/Apr/2020:20:27:49 +0800] "GET /3/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.20 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:20:27:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.22 - - [23/Apr/2020:22:10:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
192.168.1.21 - - [23/Apr/2020:23:59:49 +0800] "GET /1/index.php HTTP/1.1" 404 490 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0"
现在需要你统计每分钟的请求数，并且按照请求数降序排序。你的脚本应该输出
5 20:27 4 15:00 2 22:10 2 14:12 2 10:27 1 23:59 1 21:21 1 16:15 1 15:26 1 09:20 1 08:05
#!/bin/bash
# awk
方法1 awk -F " " '{array[substr($4,14,5)]++}END{
# for(i in array){
# print array[i] " " i
# }
# }' nowcoder.txt | sort -rnk 1

方法2 awk -F ":" '{array[$2":"$3]++}END{
for(i in array){
print array[i] " " i
}
}' nowcoder.txt | sort -rnk 1
29.netstat练习1-查看各个状态的连接数

描述
假设netstat命令运行的结果我们存储在nowcoder.txt里，格式如下：

Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 0.0.0.0:6160 0.0.0.0:* LISTEN tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 172.16.56.200:41856 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:49822 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:49674 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:42316 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:44076 172.16.240.74:6379 ESTABLISHED tcp 0 0 172.16.56.200:49656 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:58248 100.100.142.4:80 TIME_WAIT tcp 0 0 172.16.56.200:50108 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:41944 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:35548 100.100.32.118:80 TIME_WAIT tcp 0 0 172.16.56.200:39024 100.100.45.106:443 TIME_WAIT tcp 0 0 172.16.56.200:41788 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:58260 100.100.142.4:80 TIME_WAIT tcp 0 0 172.16.56.200:41812 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:41854 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:58252 100.100.142.4:80 TIME_WAIT tcp 0 0 172.16.56.200:49586 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:41754 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:50466 120.55.222.235:80 TIME_WAIT tcp 0 0 172.16.56.200:38514 100.100.142.5:80 TIME_WAIT tcp 0 0 172.16.56.200:49832 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:52162 100.100.30.25:80 ESTABLISHED tcp 0 0 172.16.56.200:50372 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:50306 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:49600 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:41908 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:60292 100.100.142.1:80 TIME_WAIT tcp 0 0 172.16.56.200:37650 100.100.54.133:80 TIME_WAIT tcp 0 0 172.16.56.200:41938 172.16.34.144:3306 ESTABLISHED tcp 0 0 172.16.56.200:49736 172.16.0.24:3306 ESTABLISHED tcp 0 0 172.16.56.200:41890 172.16.34.144:3306 ESTABLISHED udp 0 0 127.0.0.1:323 0.0.0.0:* udp 0 0 0.0.0.0:45881 0.0.0.0:* udp 0 0 127.0.0.53:53 0.0.0.0:* udp 0 0 172.16.56.200:68 0.0.0.0:* udp6 0 0 ::1:323 :::* raw6 0 0 :::58 :::* 7
现在需要你查看系统tcp连接中各个状态的连接数，并且按照连接数降序输出。你的脚本应该输出如下：
ESTABLISHED 22 TIME_WAIT 9 LISTEN 3
#!/bin/bash
# grep
方法1 grep 'tcp' nowcoder.txt | awk -F " " '{array[$6]++}END{
# for(i in array){
# print i " " array[i]
# }
# }' | sort -rnk 2
# sed
方法2 sed -n '/tcp/p' nowcoder.txt | awk -F " " '{array[$6]++}END{
# for(i in array){
# print i " " array[i]
# }
# }' | sort -rnk 2
# awk
方法3 awk -F " " '{
if($1 == "tcp"){
array[$6]++
}
}END{
for(i in array){
print i " " array[i]
}
}' | sort -rnk 2
30.netstat练习2-查看和3306端口建立的连接

描述
假设netstat命令运行的结果我们存储在nowcoder.txt里，格式如下：
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:6160 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 172.16.56.200:41856 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49822 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49674 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:42316 172.16.34.143:3306 ESTABLISHED
tcp 0 0 172.16.56.200:44076 172.16.240.74:6379 ESTABLISHED
tcp 0 0 172.16.56.200:49656 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58248 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:50108 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41944 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:35548 100.100.32.118:80 TIME_WAIT
tcp 0 0 172.16.56.200:39024 100.100.45.106:443 TIME_WAIT
tcp 0 0 172.16.56.200:41788 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58260 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:41812 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41854 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58252 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:49586 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41754 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:50466 120.55.222.235:80 TIME_WAIT
tcp 0 0 172.16.56.200:38514 100.100.142.5:80 TIME_WAIT
tcp 0 0 172.16.56.200:49832 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:52162 100.100.30.25:80 ESTABLISHED
tcp 0 0 172.16.56.200:50372 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:50306 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49600 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41908 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:60292 100.100.142.1:80 TIME_WAIT
tcp 0 0 172.16.56.200:37650 100.100.54.133:80 TIME_WAIT
tcp 0 0 172.16.56.200:41938 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49736 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41890 172.16.34.144:3306 ESTABLISHED
udp 0 0 127.0.0.1:323 0.0.0.0:*
udp 0 0 0.0.0.0:45881 0.0.0.0:*
udp 0 0 127.0.0.53:53 0.0.0.0:*
udp 0 0 172.16.56.200:68 0.0.0.0:*
udp6 0 0 ::1:323 :::*
raw6 0 0 :::58 :::* 7
现在需要你查看和本机3306端口建立连接并且状态是established的所有IP，按照连接数降序排序。你的脚本应该输出
10 172.16.0.24 9 172.16.34.144 1 172.16.34.143
#!/bin/bash
awk -F " " '{if($6 == "ESTABLISHED"){print $5}}' nowcoder.txt | grep '3306' | awk -F ":" '{array[$1]++}END{
for(i in array){
print array[i] " " i
}}' | sort -rnk 1
31.netstat练习3-输出每个IP的连接数

描述
假设netstat命令运行的结果我们存储在nowcoder.txt里，格式如下：

Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:6160 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 172.16.56.200:41856 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49822 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49674 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:42316 172.16.34.143:3306 ESTABLISHED
tcp 0 0 172.16.56.200:44076 172.16.240.74:6379 ESTABLISHED
tcp 0 0 172.16.56.200:49656 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58248 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:50108 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41944 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:35548 100.100.32.118:80 TIME_WAIT
tcp 0 0 172.16.56.200:39024 100.100.45.106:443 TIME_WAIT
tcp 0 0 172.16.56.200:41788 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58260 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:41812 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41854 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58252 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:49586 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41754 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:50466 120.55.222.235:80 TIME_WAIT
tcp 0 0 172.16.56.200:38514 100.100.142.5:80 TIME_WAIT
tcp 0 0 172.16.56.200:49832 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:52162 100.100.30.25:80 ESTABLISHED
tcp 0 0 172.16.56.200:50372 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:50306 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49600 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41908 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:60292 100.100.142.1:80 TIME_WAIT
tcp 0 0 172.16.56.200:37650 100.100.54.133:80 TIME_WAIT
tcp 0 0 172.16.56.200:41938 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49736 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41890 172.16.34.144:3306 ESTABLISHED
udp 0 0 127.0.0.1:323 0.0.0.0:*
udp 0 0 0.0.0.0:45881 0.0.0.0:*
udp 0 0 127.0.0.53:53 0.0.0.0:*
udp 0 0 172.16.56.200:68 0.0.0.0:*
udp6 0 0 ::1:323 :::*
raw6 0 0 :::58 :::* 7
现在需要你输出每个IP的连接数，按照连接数降序排序。你的脚本应该输出
172.16.0.24 10 172.16.34.144 9 100.100.142.4 3 0.0.0.0 3 172.16.34.143 1 172.16.240.74 1 120.55.222.235 1 100.100.54.133 1 100.100.45.106 1 100.100.32.118 1 100.100.30.25 1 100.100.142.5 1 100.100.142.1 1
#!/bin/bash
awk -F " " '{
if($1 == "tcp"){
split($5, a, ":")
array[a[1]]++
}}END{
for(i in array){
print i " " array[i]
}
}' nowcoder.txt | sort -rnk 2
32.netstat练习4-输出和3306端口建立连接总的各个状态数目

描述
假设netstat命令运行的结果我们存储在nowcoder.txt里，格式如下：
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:6160 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 172.16.56.200:41856 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49822 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49674 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:42316 172.16.34.143:3306 ESTABLISHED
tcp 0 0 172.16.56.200:44076 172.16.240.74:6379 ESTABLISHED
tcp 0 0 172.16.56.200:49656 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58248 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:50108 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41944 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:35548 100.100.32.118:80 TIME_WAIT
tcp 0 0 172.16.56.200:39024 100.100.45.106:443 TIME_WAIT
tcp 0 0 172.16.56.200:41788 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58260 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:41812 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41854 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:58252 100.100.142.4:80 TIME_WAIT
tcp 0 0 172.16.56.200:49586 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41754 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:50466 120.55.222.235:80 TIME_WAIT
tcp 0 0 172.16.56.200:38514 100.100.142.5:80 TIME_WAIT
tcp 0 0 172.16.56.200:49832 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:52162 100.100.30.25:80 ESTABLISHED
tcp 0 0 172.16.56.200:50372 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:50306 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49600 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41908 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:60292 100.100.142.1:80 TIME_WAIT
tcp 0 0 172.16.56.200:37650 100.100.54.133:80 TIME_WAIT
tcp 0 0 172.16.56.200:41938 172.16.34.144:3306 ESTABLISHED
tcp 0 0 172.16.56.200:49736 172.16.0.24:3306 ESTABLISHED
tcp 0 0 172.16.56.200:41890 172.16.34.144:3306 ESTABLISHED
udp 0 0 127.0.0.1:323 0.0.0.0:*
udp 0 0 0.0.0.0:45881 0.0.0.0:*
udp 0 0 127.0.0.53:53 0.0.0.0:*
udp 0 0 172.16.56.200:68 0.0.0.0:*
udp6 0 0 ::1:323 :::*
raw6 0 0 :::58 :::* 7
现在需要你输出和本机3306端口建立连接的各个状态的数目，按照以下格式输出
TOTAL_IP表示建立连接的ip数目 TOTAL_LINK表示建立连接的总数目
TOTAL_IP 3 ESTABLISHED 20 TOTAL_LINK 20
#!/bin/bash
b=0
awk -F " " '$1~"tcp"' nowcoder.txt | awk '{if($5~/.*:3306/ && $6 == "ESTABLISHED"){
split($5,a,":")
array[a[1]]++
b++
}}END{
printf("TOTAL_IP %d\nESTABLISHED %d\nTOTAL_LINK %d",length(array),b,b)
}' 
33.业务分析-提取值

描述
假设我们的日志nowcoder.txt里，内容如下
12-May-2017 10:02:22.789 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server version:Apache Tomcat/8.5.15
12-May-2017 10:02:22.813 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server built:May 5 2017 11:03:04 UTC
12-May-2017 10:02:22.813 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server number:8.5.15.0
12-May-2017 10:02:22.814 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name:Windows, OS Version:10
12-May-2017 10:02:22.814 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture:x86_64
现在需要你提取出对应的值，输出内容如下
serverVersion:Apache Tomcat/8.5.15 serverName:8.5.15.0 osName:Windows osVersion:10
#!/bin/bash
awk -F "[:,]" '{
if($0~"Server version"){
printf("serverVersion:%s",$4)
printf("\n")
}
if($0~"Server number"){
printf("serverName:%s",$4)
printf("\n")
}
if($0~"OS Name"){
printf("osName:%s",$4)
printf("\n")
printf("osVersion:%s",$6)
}
}' nowcoder.txt
34.ps分析-统计VSZ,RSS各自总和

描述
假设命令运行的结果我们存储在nowcoder.txt里，格式如下：
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.1 37344 4604 ? Ss 2020 2:13 /sbin/init
root 231 0.0 1.5 166576 62740 ? Ss 2020 15:15 /lib/systemd/systemd-journald
root 237 0.0 0.0 0 0 ? S< 2020 2:06 [kworker/0:1H]
root 259 0.0 0.0 45004 3416 ? Ss 2020 0:25 /lib/systemd/systemd-udevd
root 476 0.0 0.0 0 0 ? S< 2020 0:00 [edac-poller]
root 588 0.0 0.0 276244 2072 ? Ssl 2020 9:49 /usr/lib/accountsservice/accounts-daemon
message+ 592 0.0 0.0 42904 3032 ? Ss 2020 0:01 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
root 636 0.0 0.0 65532 3200 ? Ss 2020 1:51 /usr/sbin/sshd -D
daemon 637 0.0 0.0 26044 2076 ? Ss 2020 0:00 /usr/sbin/atd -f
root 639 0.0 0.0 29476 2696 ? Ss 2020 3:29 /usr/sbin/cron -f
root 643 0.0 0.0 20748 1992 ? Ss 2020 0:26 /lib/systemd/systemd-logind
syslog 645 0.0 0.0 260636 3024 ? Ssl 2020 3:17 /usr/sbin/rsyslogd -n
root 686 0.0 0.0 773124 2836 ? Ssl 2020 26:45 /usr/sbin/nscd
root 690 0.0 0.0 19472 252 ? Ss 2020 14:39 /usr/sbin/irqbalance --pid=/var/run/irqbalance.pid
ntp 692 0.0 0.0 98204 776 ? Ss 2020 25:18 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 108:114
uuidd 767 0.0 0.0 28624 192 ? Ss 2020 0:00 /usr/sbin/uuidd --socket-activation
root 793 0.0 0.0 128812 3148 ? Ss 2020 0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
www-data 794 0.0 0.2 133376 9120 ? S 2020 630:57 nginx: worker process
www-data 795 0.0 0.2 133208 8968 ? S 2020 633:02 nginx: worker process
www-data 796 0.0 0.2 133216 9120 ? S 2020 634:24 nginx: worker process
www-data 797 0.0 0.2 133228 9148 ? S 2020 632:56 nginx: worker process
web 955 0.0 0.0 36856 2112 ? Ss 2020 0:00 /lib/systemd/systemd --user
web 956 0.0 0.0 67456 1684 ? S 2020 0:00 (sd-pam)
root 1354 0.0 0.0 8172 440 tty1 Ss+ 2020 0:00 /sbin/agetty --noclear tty1 linux
root 1355 0.0 0.0 7988 344 ttyS0 Ss+ 2020 0:00 /sbin/agetty --keep-baud 115200 38400 9600 ttyS0 vt220
root 2513 0.0 0.0 0 0 ? S 13:07 0:00 [kworker/u4:1]
root 2587 0.0 0.0 0 0 ? S 13:13 0:00 [kworker/u4:2]
root 2642 0.0 0.0 0 0 ? S 13:17 0:00 [kworker/1:0]
root 2679 0.0 0.0 0 0 ? S 13:19 0:00 [kworker/u4:0]
root 2735 0.0 0.1 102256 7252 ? Ss 13:24 0:00 sshd: web [priv]
web 2752 0.0 0.0 102256 3452 ? R 13:24 0:00 sshd: web@pts/0
web 2753 0.5 0.1 14716 4708 pts/0 Ss 13:24 0:00 -bash
web 2767 0.0 0.0 29596 1456 pts/0 R+ 13:24 0:00 ps aux
root 10634 0.0 0.0 0 0 ? S Nov16 0:00 [kworker/0:0]
root 16585 0.0 0.0 0 0 ? S< 2020 0:00 [bioset]
root 19526 0.0 0.0 0 0 ? S Nov16 0:00 [kworker/1:1]
root 28460 0.0 0.0 0 0 ? S Nov15 0:03 [kworker/0:2]
root 30685 0.0 0.0 36644 2760 ? Ss 2020 0:00 /lib/systemd/systemd --user
root 30692 0.0 0.0 67224 1664 ? S 2020 0:00 (sd-pam)
root 32689 0.0 0.0 47740 2100 ? Ss 2020 0:00 /usr/local/ilogtail/ilogtail
root 32691 0.2 0.5 256144 23708 ? Sl 2020 1151:31 /usr/local/ilogtail/ilogtail
现在需要你统计VSZ，RSS各自的总和（以M兆为统计），输出格式如下
MEM TOTAL VSZ_SUM:3250.8M,RSS_SUM:179.777M
#!/bin/bash
awk -F " " 'BEGIN{v=0;r=0}{
v+=$5
r+=$6
}END{
print("MEM TOTAL")
printf("VSZ_SUM:%sM,RSS_SUM:%sM",v/1024,r/1024)
}' nowcoder.txt

Leetcode部分：

1.统计词频

写一个 bash 脚本以统计一个文本文件 words.txt 中每个单词出现的频率。

为了简单起见，你可以假设：

    words.txt只包括小写字母和 ' ' 。
    每个单词只由小写字母组成。
    单词间由一个或多个空格字符分隔。

示例:

假设 words.txt 内容如下：

the day is sunny the the
the sunny is is

你的脚本应当输出（以词频降序排列）：

the 4
is 3
sunny 2
day 1

说明:

    不要担心词频相同的单词的排序问题，每个单词出现的频率都是唯一的。
    你可以使用一行 Unix pipes 实现吗？

来源：力扣（LeetCode）
链接：https://leetcode.cn/problems/word-frequency
著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

# Read from the file words.txt and output the word frequency list to stdout.
#!/bin/bash
awk -F " " '{for(i=1;i<=NF;i++){
array[$i]++
}}END{for(j in array){
print j " " array[j]
}}' words.txt | sort -rnk 2

2.有效电话号码

给定一个包含电话号码列表（一行一个电话号码）的文本文件 file.txt，写一个单行 bash 脚本输出所有有效的电话号码。

你可以假设一个有效的电话号码必须满足以下两种格式： (xxx) xxx-xxxx 或 xxx-xxx-xxxx。（x 表示一个数字）

你也可以假设每行前后没有多余的空格字符。

示例：

假设 file.txt 内容如下：

987-123-4567
123 456 7890
(123) 456-7890

你的脚本应当输出下列有效的电话号码：

987-123-4567
(123) 456-7890

来源：力扣（LeetCode）
链接：https://leetcode.cn/problems/valid-phone-numbers
著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

# Read from the file file.txt and output all valid phone numbers to stdout.
grep -E '^([0-9]{3}-|\([0-9]{3}\) )[0-9]{3}-[0-9]{4}$' file.txt

3.转置文件

给定一个文件 file.txt，转置它的内容。

你可以假设每行列数相同，并且每个字段由 ' ' 分隔。

示例：

假设 file.txt 文件内容如下：

name age
alice 21
ryan 30

应当输出：

name alice ryan
age 21 30

来源：力扣（LeetCode）
链接：https://leetcode.cn/problems/transpose-file
著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

# Read from the file file.txt and print its transposed content to stdout.
awk -F " " '{for(i=1;i<=NF;i++){
    if(NR==1){
        array[i]=$i
    }else{
        array[i]=array[i] " " $i
    }
}}END{
    for(j=1;j<=NF;j++){
        print array[j]
    }
}'  file.txt

4.第十行

给定一个文本文件 file.txt，请只打印这个文件中的第十行。

示例:

假设 file.txt 有如下内容：

Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10

你的脚本应当显示第十行：

Line 10

说明:
1. 如果文件少于十行，你应当输出什么？
2. 至少有三种不同的解法，请尝试尽可能多的方法来解题。

来源：力扣（LeetCode）
链接：https://leetcode.cn/problems/tenth-line
著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

# Read from the file file.txt and output the tenth line to stdout.
awk '{if(NR==10){
print $0
}}' file.txt

力扣的题都在前面牛客部分做过就随便跑一下，希望有帮助，大家多讨论。

标签：Shell,0.0,45.0,nowcoder,牛客,2020,172.16,txt,Leetcode
来源： https://www.cnblogs.com/zhuozige/p/16491713.html

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