我想检查第一列中两行是否以相同的数字开头,如果发生这种情况,则应显示第二列的平均值.文件示例:
01 21 6 10% 93.3333% 01 22 50 83.3333% 93.3333% 02 20.5 23 18.1102% 96.8504% 02 21.5 100 78.7402% 96.8504% 03 22.2 0 0% 100% 03 21.2 29 100% 100% 04 22.5 1 5.55556% 100% 04 23.5 17 94.4444% 100% 05 22.7 9 7.82609% 100% 05 21.7 106 92.1739% 100% 06 23 11 17.4603% 96.8254% 06 22 50 79.3651% 96.8254% 07 20.5 14 18.6667% 96% 07 21.5 58 77.3333% 96% 08 21.8 4 100% 100% 09 22.6 0 0% 100% 09 21.6 22 100% 100%
例如,两个第一行以01开头,但只有一行以08(第15行)开头.因此,基于这两种情况的输出应该是:
01 21.5 ... ... ... 08 21.8 ... ... ...
我最终得到了以下awk行,当文件总是有两条相似的行时效果很好,但它使用上面显示的文件失败了(因为第15行):
awk '{sum+=$2} (NR%2)==0{print sum/2; sum=0;}'
任何提示都受到欢迎,
这awk应该工作:
原文链接:https://www.f2er.com/bash/383498.htmlawk 'function dump(){if (n>0) printf "%s%s%.2f\n",p,OFS,sum/n} NR>1 && $1 != p{dump(); sum=n=0} {p=$1; sum+=$2; n++} END{dump()}' file 01 21.5 02 21.0 03 21.7 04 23.0 05 22.2 06 22.5 07 21.0 08 21.8 09 22.1
说明:我们使用3个变量:
p -> to hold prevIoUs row's $1 value n -> count of similar $1 values sum -> is sum of $2 values for similar $1 rows
这个怎么运作:
NR>1 && $1 != p # when row #1 > 1 and prev $1 is not current $1 dump() # function is to print formatted value of $1 and average p=$1; sum+=$2; n++ # sets p to $1,adds current $2 to sum and increments n