Book Image

Bash Quick Start Guide

By : Tom Ryder
Book Image

Bash Quick Start Guide

By: Tom Ryder

Overview of this book

Bash and shell script programming is central to using Linux, but it has many peculiar properties that are hard to understand and unfamiliar to many programmers, with a lot of misleading and even risky information online. Bash Quick Start Guide tackles these problems head on, and shows you the best practices of shell script programming. This book teaches effective shell script programming with Bash, and is ideal for people who may have used its command line but never really learned it in depth. This book will show you how even simple programming constructs in the shell can speed up and automate any kind of daily command-line work. For people who need to use the command line regularly in their daily work, this book provides practical advice for using the command-line shell beyond merely typing or copy-pasting commands into the shell. Readers will learn techniques suitable for automating processes and controlling processes, on both servers and workstations, whether for single command lines or long and complex scripts. The book even includes information on configuring your own shell environment to suit your workflow, and provides a running start for interpreting Bash scripts written by others.
Table of Contents (10 chapters)

Input, Output, and Redirection

In this chapter, we'll look at how to manage input and output for Bash commands, specifying where any input into a command should come from, and where any output or errors from it should go. We can manage each of these using Bash's support for classic shell redirection, specifying a source or a destination for the data in the form of a path to a file.

In addition to file-based redirection, we'll also explore the use of pipes to transparently direct the output of one command straight into the input of another, a powerful means of composing (or combining) programs by having them work together. We'll also take a brief look at some general data-filtering possibilities using the sed and AWK programming languages.

In this chapter, we'll cover the following topics:

  • Managing input and output from programs
  • Controlling file-based...