awk统计总结

(1)awk求和

cat data |awk '{sum+=$1} END {print "Sum = ", sum}'

(2)平均值

cat data|awk '{sum+=$1} END {print "Average = ", sum/NR}'

(3)求最大值

cat data|awk 'BEGIN {max = 0} {if ($1>max) max=$1 fi} END {print "Max=", max}'

(4)求最小值(min的初始值设置一个超大数即可)

cat data | awk 'BEGIN {min = 1999999} {if ($1awk '{sum[$2]+=1}END{for(i in sum)print i"\t"sum[i]}'  test.txt

(6)如只统计文件test.txt中第2列"00"或"01"出现的次数,命令可写为

awk '{if($2=="00") ++sum1;if($7=="01") ++sum2}END{print "00""\t"sum1"\n""01""\t"sum2}' test.txt

(7)统计文本各个字段出现次数

awk '{ for (i=1;i<=NF;i++){a[$i]++} } END{for (b in a) print b": "a[b]}' test.txt

 

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