In this article of the shell scripting tutorial series, we’ll learn how to create and use variables in shell scripts. We’ll walk through the different variables that we can make use of that are provided by the system for the Bourne Shell and how to create custom variables to use throughout a shell script. Variables
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The installation for MySQL on Debian will be through the APT repository. Now there is a default MySQL server installation and one that is offered by Oracle through their software repositories. We’ll take the official route by first adding Oracle’s sources first and then installing the MySQL server. How to Install MySQL on Debian/Ubuntu Before
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The tail command in Linux displays the last few lines/blocks of any file, the number of lines/blocks being dependent on the options passed when using the command. Also read: The uptime Command in Linux The Linux tail command default output When no options are provided, the tail command prints the last 10 lines for all
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In the previous shell scripting tutorial, we worked with simple variables in shell scripts. Today we’ll cover arrays in shell scripts, and how we can create and make use of arrays within our scripts. To declare or create arrays on the fly, we will use the declare command (more explicit) or directly write array_name=(element1 element2
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Changing the SSH port on Linux is pretty easy and straightforward. As it is with most of the packages that are available for any Linux distribution including Ubuntu, they come with a configuration file. Let’s modify that configuration file and update our port to something that’s not so commonly available. Change SSH Port in Linux
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With the introduction of Ubuntu 16.04 LTS, the “apt” command started being noticed by bloggers and average Linux users. Every Ubuntu-based tutorial that popped up on the internet used apt install instead of what we were normally used to seeing, i.e. apt-get install. Let’s see what exactly the apt command is, and why a new
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In our previous tutorial, we learned the use of the while loop in shell scripts. Now, let’s make use of the break and continue statement in Linux and manipulate the flow of loops. As we know, a loop will end if the condition supplied to it becomes FALSE. But what if you’re running a loop
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PING (Packet INternet Groper) is a network administration utility used to check the connectivity status between a source and a destination computer/device over an IP network. It also helps you assess the time it takes to send and receive a response from the network. Basic Principles behind ping Command Whenever there is a requirement to
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The touch command in Linux is used to update timestamps on files, namely, the access and modification time for any file(s). This is basically ‘touching’ the file, and hence the name of the command. This command has different options through which we could modify certain timestamps for the files provided as arguments. 1. Using touch
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After learning the basics in our previous tutorials about if-else statements, switch-case statements, etc, it’s time to create functions in shell scripts. Functions help us divide scripts into different sections and make the code more portable as well as reusable. Defining Functions in Shell Scripts The basic syntax for defining a function is just the
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