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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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Using the bash -x and -v options

Up to this point, we have tried debugging using different methods that involved commands inserted into our scripts. Regardless of the command we used, this approach has one drawback – whatever we do, using commands inside the script is either very localized to a particular part of a given script or too global since it has to cover a good chunk of code. We are not saying that this is not a valid way of solving problems in scripts, but we still need more ways to debug.

Getting ready

The only thing we need to know before we start using this is that we will be running scripts by invoking them as parameters of the interpreter, so something like this:

bash -options <scriptname>

This is important since we can not use any of these options if we invoke scripts in any other way.

How to do it…

Bash is in this respect pretty complicated since it offers little, in fact almost nothing, in terms of support for any reasonable...

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