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Linux Command Line and Shell Scripting Techniques

Linux Command Line and Shell Scripting Techniques

By : 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: 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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Loading an external function to a shell script

A problem that will often pop up when you need to create more complex shell scripts is going to be how to include other code into your script. Once you start scripting, you will often create a couple of common functions that you always use—things such as opening connections to servers, getting some operations done, and other things like that.

Sometimes, your scripts will have to use a lot of preset variables that are defined by the user before they even run the script in order to avoid having to type them in each time a script is called.

Of course, the solution to both of these problems can be to simply copy and paste the relevant code into your script and to make the user edit the script before running it. The reason we should never do this is that each time we copy and paste something, we are creating a new version of our code. If we notice an error in the code, we need to fix it in all the scripts that reuse it. Luckily...

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