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, awk15_ex2.awk, awk15_testdata2, awk15_ex3.awk, awk15_ex4.awk, awk15_ex5.awk, awk15_ex6.awk, awk15_ex7.awk