awk NR, NF

NR(number of Record?)

NF(number of Field?)

[링크 : https://ko.wikibooks.org/wiki/예제로_배우는_AWK/필드와_레코드]

 

The variable NF is set to the total number of fields in the input record.

[링크 : https://linux.die.net/man/1/awk]