Author: Rahul

JQ is a powerful and flexible command-line JSON processor for Linux, designed to parse, filter, and transform JSON data. Its lightweight nature and speed make it an essential tool for developers working with JSON files. In this article, we will explore how to use the JQ command-line tool to pretty print JSON files in Linux, improving readability and enhancing the debugging process. 1. Installing JQ on Your System Before you can use JQ to pretty print JSON files, you need to install it on your Linux distribution. The installation process varies depending on the package manager used by your distribution.…

DNS (Domain Name System) is a critical component of the internet that translates human-readable domain names into IP addresses that computers can understand. When DNS issues arise, it can be challenging to diagnose the problem. This is where the Dig command-line tool comes in handy. Dig is a powerful DNS troubleshooting tool that allows users to query DNS servers and retrieve information about domain names, IP addresses, and other DNS records. In this article, we will explore 15 examples of using Dig for DNS troubleshooting. Section 1: Basic Dig Commands In this section, we will explore some basic Dig commands…

Git is an essential tool for developers, enabling efficient code versioning, management, and collaboration. One of the key aspects of working with Git is sharing local branches with remote repositories, allowing multiple team members to contribute to the same project. In this article, we will provide a comprehensive guide to pushing new local branches to remote Git repositories, making collaboration more effective and streamlined. Step 1: Create a New Local Branch Before you can push a new local branch to a remote repository, you must first create the branch. To do this, use the git checkout command with the -b…

Git is a powerful version control system that helps developers manage code efficiently and collaborate with their teams. Two essential Git commands for working with remote repositories are ‘git pull’ and ‘git fetch’. Although they seem similar, understanding their differences is crucial for streamlining your Git workflow and maintaining a clean project history. In this article, we will explore the ‘git pull’ and ‘git fetch’ commands in-depth, explaining their unique features and when to use each one. ‘git fetch’: Syncing Remote Changes The ‘git fetch’ command is used to download changes from a remote repository to your local repository without…

Bash is a popular shell used in most Linux distributions. It provides various I/O redirection techniques that allow users to control how input and output are processed in their commands and scripts. One of the most commonly used I/O redirection techniques is 2>&1, which redirects standard error (stderr) to standard output (stdout). In this article, we will provide a beginner’s guide to understanding 2>&1 in Bash. What is 2>&1? 2>&1 is an I/O redirection operator used in Bash that redirects the stderr stream to the same destination as the stdout stream. In other words, it merges the error output with…

A shell script is a powerful tool for automating tasks on Unix-based systems. One common requirement when writing shell scripts is checking if a particular program or command exists on the system. This article will guide you through different methods to perform this check, allowing you to make your script more robust and reliable. Table of Contents: Using the command -v Utilizing the type command Relying on the which command Employing the hash command Tips for best practices 1. Using the command -v The `command -v` is a POSIX-compliant method for checking the existence of a program. It’s a built-in…

The shebang, also known as a “hashbang” or “sharpbang”, is an essential part of Bash scripts and other executable scripts in Unix-based systems. This seemingly simple line of code tells the operating system how to interpret and execute the script. In this article, we will explore the history and purpose of shebangs, common Bash shebangs and their meanings, how shebangs affect script portability, differences between shebangs in various Linux distributions, and tips for ensuring your Bash script runs as expected with the appropriate shebang. History and Purpose of Shebangs The shebang was introduced in Unix systems in the late 1970s…

Remote access to servers and other devices is a critical task for many professionals, including system administrators, developers, and IT technicians. SSH (Secure Shell) is a popular protocol used to connect to remote devices securely, and SSH clients are used to establish these connections. However, the command-line interface used by most SSH clients can be intimidating and difficult for some users. In this article, we’ll introduce you to some user-friendly SSH clients for Windows that make remote access easy. 1. MobaXterm MobaXterm is a user-friendly SSH client that’s designed for system administrators and power users. MobaXterm includes a tabbed interface,…

Postfix is a popular open-source mail transfer agent (MTA) used to route and deliver email on Linux systems. It provides a robust and efficient means of handling mail delivery. In this tutorial, we will show you how to configure Postfix to use Gmail’s SMTP service on Ubuntu and Debian-based systems. This setup allows you to send emails through Gmail’s infrastructure, providing better deliverability and reducing the chances of your emails being marked as spam. Prerequisites Before proceeding, ensure that you have the following: A system running Ubuntu or Debian-based distribution. A Gmail account or Google Workspace account with ‘Less secure…

PHP is a server-side scripting language that is used to develop dynamic web applications. Arrays are an essential part of PHP, and they allow developers to store and manipulate multiple values in a single variable. In this tutorial, we’ll discuss PHP arrays, their types, how to create and manipulate them, and some useful array functions. What is an Array in PHP? An array is a special type of variable that can store multiple values in a single variable. In PHP, arrays can store different types of data, such as integers, strings, and even other arrays. Each value in an array…