Linux

This article will show you how to use variables in Bash and Shell scripts in Linux. Bash (or Linux Shell) scripts are files you write containing commands to automate common tasks and save yourself some time. Variables are things in scripts that hold a value for later use – a number, or a filename, or anything, really. Here’s how to define and use variables in Linux Shell scripts. These examples should work in the most popular Linux Shells, Bash, and Zsh. Declaring Bash Variables Bash VARIABLES ARE UNTYPED … Read more

This article will explain how to use functions in Bash scripts – helping you to reuse your code and simplify your scripts. Why write code multiple times when you can write it once and re-use it? That’s what functions let you do. This article outlines the use of functions in Bash/Shell scripts. What is a Function? A function is a piece of re-usable code. Functions can accept parameters, which allow them to perform the same repeatable actions on different inputs. Functions usually perform any action, output or print results, or return … Read more

This article explains the sleep command in Bash/Shell scripts and how and why you might use it. The sleep command in Bash (and other Linux Shells) pauses execution for a specified amount of time – halting the script for a set number of seconds, minutes, hours, etc. Why Pause Execution? Why would you want to pause executing your script? Give the user a chance to interrupt an automated action Await user input Wait for a device to warm up/become available Stop text from flying across the screen if you’re trying to … Read more