How to convert JSON to CSV using Linux / Unix shell
Today I will talk about a common problem faced by many Linux or Unix sysadmins and developers. Typically modern apps and security devices heavily depend upon APIs and lists that …
How to trim leading and trailing white space in bash
So I have this specific use case where I get data in a comma-separated values (CSV) file. I pick up the company name, address, telephone, email, and some other data …
How To Create GUI Dialog Boxes In Bash Scripts With Whiptail In Linux
A while ago, we briefly discussed about Zenity, a simple program that allows you to create graphical (GTK+) dialog boxes in command-line and shell scripts. In this article, we are …
How to Setup SSH Passwordless Login in Linux [3 Easy Steps]
SSH (Secure SHELL) is an open-source and most trusted network protocol that is used to log in to remote servers for the execution of commands and programs. It is also …
Bash Scripting – Variables Explained With Examples
Variables are very important concepts in any programming language you work with. Think of a variable as a container in memory that stores data of a certain type. The main …
Bash Redirection Explained With Examples
Redirection and piping are two useful features in bash scripting that sysadmins and developers use often. In this guide, we will discuss what is Bash Redirection and how to work …
How to find and replace ALL IP addresses with a new one
At a certain point, I needed to change the VLAN IP address such as 172.0.0.2 with 172.0.0.1 for ease of use. As you know, Linux and Unix-like operating system stores …
How to repeat a character ‘n’ times in Bash
Let us say you want to repeat a character such as ‘-‘ OR ‘=‘ multiple times while writing bash script. Please note that I needed a quick script to work …
How to Use Break and Continue Statements in Shell Scripts
In this article, we will take a look at how to use a break and continue in bash scripts. In bash, we have three main loop constructs (for, while, until). …
How to Use until Loop in Your Shell Scripts
In bash for, while, and until are three loop constructs. While each loop differs syntactically and functionally their purpose is to iterate over a block of code when a certain …