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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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Advanced array manipulation

Now we have finished dealing with the basics, we need to add much more to your knowledge of arrays. What we first need to do is to give you some ideas on how to make the arrays you create in your scripts more persistent, so we need to deal with storing and restoring them.

The reason why this is important is that arrays can be quite large, depending on the script you are creating. Dumping and reusing variables in scripts is easy since we can use the source to declare variables we stored in a file. Arrays make for more complicated work since they can contain multiple variables, and sometimes we even need to create them from another data source.

Getting ready

The thing with scripts is that they sometimes need to deal with a lot of data. In a lot of cases, we can use files to both store data in and load data from. There are, however, some cases where arrays—especially associative arrays—are a necessity for working with large amounts...

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