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Linux Command Line and Shell Scripting Techniques

Linux Command Line and Shell Scripting Techniques

By : Vedran Dakic, Jasmin Redzepagic
4.4 (5)
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Linux Command Line and Shell Scripting Techniques

Linux Command Line and Shell Scripting Techniques

4.4 (5)
By: Vedran Dakic, Jasmin Redzepagic

Overview of this book

Linux Command Line and Shell Scripting Techniques begins by taking you through the basics of the shell and command-line utilities. You’ll start by exploring shell commands for file, directory, service, package, and process management. Next, you’ll learn about networking - network, firewall and DNS client configuration, ssh, scp, rsync, and vsftpd, as well as some network troubleshooting tools. You’ll also focus on using the command line to find and manipulate text content, via commands such as cut, egrep, and sed. As you progress, you'll learn how to use shell scripting. You’ll understand the basics - input and output, along with various programming concepts such as loops, variables, arguments, functions, and arrays. Later, you’ll learn about shell script interaction and troubleshooting, before covering a wide range of examples of complete shell scripts, varying from network and firewall configuration, through to backup and concepts for creating live environments. This includes examples of performing scripted virtual machine installation and administration, LAMP (Linux, Apache, MySQL, PHP) stack provisioning and bulk user creation for testing environments. By the end of this Linux book, you’ll have gained the knowledge and confidence you need to use shell and command-line scripts.
Table of Contents (19 chapters)
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Manipulating shell script input, output, and errors

There are only a few things that are as pragmatic as the idea behind the concept of standard input and standard output on Linux.

Since the start of Unix, the idea of interoperability between different applications and tools installed on a system was one of the primary prerequisites that every script, tool, and application had to follow.

Simply put, if you wrote any tool on a system, you could count on three separate channels of communication to your surroundings. Based on the concept of ANSI C input/output streams called standard output and standard input, everything that runs in a shell can communicate in three ways – it can receive inputs from standard input, it can output results and information to standard output, and it can report errors to a separate output that is marked just for this task as error output.

Pair this idea with the concept that every tool should output text-only information with minimal formatting...

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