Introduction

This is the fifteenth episode of the “Learning Awk” series which is being produced by b-yeezi and myself.

This is the second of a pair of episodes looking at redirection in Awk scripts.

In this episode I will spend some time looking at the getline command used for explicit input (as opposed to the usual implicit sort), often with redirection. The getline command is a complex subject which I will cover only relatively briefly. You are directed to the getline section of the GNU Awk User’s Guide for the full details.

Long notes

I have provided detailed notes as usual for this episode, and these can be viewed here.

Links

GNU Awk User’s Guide

Explicit Input with getline

Using getline with No Arguments

Using getline with a coprocess

Getline notes

Two-way I/O

Previous shows in this series on HPR:

“Gnu Awk - Part 1” - episode 2114

“Gnu Awk - Part 2” - episode 2129

“Gnu Awk - Part 3” - episode 2143

“Gnu Awk - Part 4” - episode 2163

“Gnu Awk - Part 5” - episode 2184

“Gnu Awk - Part 6” - episode 2238

“Gnu Awk - Part 7” - episode 2330

“Gnu Awk - Part 8” - episode 2438

“Gnu Awk - Part 9” - episode 2476

“Gnu Awk - Part 10” - episode 2526

“Gnu Awk - Part 11” - episode 2554

“Gnu Awk - Part 12” - episode 2610

“Gnu Awk - Part 13” - episode 2804

“Gnu Awk - Part 14” - episode 2816

Resources:

ePub version of these notes

Examples: awk15_testdata1, awk15_ex1.awk,