Linux三剑客awk数组、判断、循环

shell数组

awk数组

形式

array[0]=oldboy array[1]=lidao

array[0]=oldboy array[1]=lidao

使用

echo ${array[0]} ${array[1]}

print array[0] array[1]

批量输出数组的内容

for i in ${array[*]}

do

echo $i

done

for(i in array)

awk批量输出数组内容

awk 'BEGIN{a[0]=12306; a[1]="lidao"; a[2]="hello"; a[3]=123; for(i in a) print i,a[i]};'

统计下面每个URL出现的次数

-vFS=/ '{array[$3]++;}END{for (url in array) print url, array[url]}' url.txtawk -vFS=/ '{array[$3]++;}END{for (url in array) print url, array[url]}' url.txt | sort

awk '$9~[0-9][0-9][0-9]/{array[$9]++}END{for (i in array) print i, array[i]}' access.log | sort

awk循环

1-100求和

awk 'BEGIN{for(i=1;i<=100;i++){sum+=i;} print sum;}'

awk判断

磁盘利用率大于20%，则显示"disk not enough"

df -h | awk -F"[ %]+" 'NR>1{if($5>20){print "disk not enough", $1, $5,$NF}}'

awk使用条件判断时，第一个条件在{动作}前，后面还有条件判断用if

统计一段文本中，单词长度小于6的单词数量

Studying a subject that you feel pointless is never a fun or easy task. If you're study history, asking yourself the question "why is history important" is a very good first step. History is an essential part of human civilization. You will find something here that will arouse your interest, or get you thinking about the significance of history.

shen@ubuntu-vm:~/code/test$ awk -F"[ .\",]+" '{for(i=1;i<=NF;i++){print $i}}' en.txt StudyingasubjectthatyoufeelpointlessisneverafunoreasytaskIfyou'restudyhistoryaskingyourselfthequestionwhyishistoryimportantisaverygoodfirststepHistoryisanessentialpartofhumancivilizationYouwillfindsomethingherethatwillarouseyourinterestorgetyouthinkingaboutthesignificanceofhistoryshen@ubuntu-vm:~/code/test$ awk -F"[ .\",]+" '{for(i=1;i<=NF;i++){if(length($i)>6)print $i}}' en.txt StudyingsubjectpointlesshistoryyourselfquestionhistoryimportantHistoryessentialcivilizationsomethinginterestthinkingsignificancehistoryshen@ubuntu-vm:~/code/test$ awk -F"[ .\",]+" '{for(i=1;i<=NF;i++){if(length($i)>6) sum+=1}} END{print sum}' en.txt 16

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