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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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Passing arguments to a function

We started demonstrating what a function looks like by showing you a simple script, the simplest we could create. We still haven't defined how to talk to your function, and we still don't know how to give a function some parameters or arguments and get something in return. In this recipe, we are going to fix that.

Getting ready

Since we mentioned arguments, we need to talk a little about them. bash treats arguments in functions the same as it does in the script itself—arguments become local variables inside the function block. To return a value, we also do almost exactly the same as when we need to deal with the whole script—we simply return a value from our function block and then read it inside the main script body.

Remember when we said you can reference arguments that were given to your script when it was initially called, and that we used variables called $1, $2, $3, and so on to get the first, second, third,...

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