shell - awk 中的管道如何工作（保留标头排序）

Question

下面的命令输出一个文件的头部并且在头部之后对记录进行排序。但它是如何工作的？谁能解释一下这个命令？

awk 'NR == 1; NR > 1 {print $0 | "sort -k3"}'

标签： shellawk

Answer 1

请您看一遍（仅用于解释目的）。为了学习更多的概念，awk我建议通过Stack Overflow 不错的 awk 学习部分

awk '                    ##Starting awk program from here.
NR == 1;                 ##Checking if line is first line then print it.
##awk works on method of condition then action since here is NO ACTION mentioned so by default printing of current line will happen
NR > 1{                  ##If line is more than 1st line then do following.
 print $0 | "sort -k3"   ##It will be keep printing lines into memory and before printing it will sort them with their 3rd field.
}'