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The GNU Awk User's Guide

4.8.10 Summary of getline Variants

The following table summarizes the eight variants of getline, listing which built-in variables are set by each one.

This is a gawk extension This is a gawk extension

getline	Sets $0, NF, FNR, and NR
getline var	Sets var, FNR, and NR
getline < file	Sets $0 and NF
getline var < file	Sets var
command | getline	Sets $0 and NF
command | getline var	Sets var
command |& getline	Sets $0 and NF.
command |& getline var	Sets var.