Author: Rahul

Bash is a powerful shell that provides a wide range of special variables that can be used to manipulate and control the behavior of scripts. These variables provide essential information about the environment in which the script is running, including the command-line arguments, the current process ID, and the status of the last executed command. In this article, we’ll provide an in-depth guide to all bash special variables, including examples of their usage and common pitfalls to avoid. `$0` – The name of the script being executed. `$1-$9` – The first nine command-line arguments. `$#` – The number of command-line…

Bash is a powerful scripting language that can be used for a variety of tasks, including mathematical calculations. However, working with numbers in Bash can be challenging, especially when dealing with floating-point arithmetic, large numbers, and complex calculations. In this article, we will explore some tips and tricks for mathematical calculations in Bash. Use the Right Tool for the Job Bash has several built-in tools for performing mathematical calculations, such as the (( )) and $(( )) operators, the expr command, and the bc command. Each tool has its strengths and weaknesses, and choosing the right one can make a…

When it comes to mathematical calculations in Bash, there are a few built-in tools that you can use, such as the expr command and the “(( ))” arithmetic expression. However, there are also other tools that can come in handy, such as awk and sed, which are powerful text processing tools that can be used to perform calculations on data stored in files or output by other commands. In this article, we will explore how to use awk, bc, and expr to perform math calculations in Bash, and how to choose the right tool for the job. Using Awk for…

Squid is a popular open-source proxy server that can be used to enhance the security and performance of your Debian server. Once you have installed Squid, you need to configure it to suit your specific needs. In this tutorial, we will provide a comprehensive guide to configuring Squid proxy on Debian. Step 1: Configuring Access Control Access control is an essential part of any proxy server configuration. Squid provides several access control features that allow you to control which clients can access the proxy server. You can use the acl (access control list) and http_access options to define rules for…

Linux provides various commands to perform different types of system shutdowns. However, the terms used to refer to these shutdown types can be confusing, especially for new Linux users. In this article, we’ll discuss the differences between shutting down, restarting, and halting Linux, and when to use each of these commands. Shutting Down Linux When you shut down Linux, you are essentially turning off the system. The shutdown process saves any open files, terminates running processes, and safely powers off the hardware. When you shut down Linux, you need to make sure that you save all your work, as any…

Android is one of the most popular mobile operating systems in the world, powering millions of devices across the globe. If you’re a developer looking to land a job in the Android development space, you’ll likely be asked a variety of questions related to the platform during your interview. In this article, we’ll go over 20 common Android interview questions and their corresponding answers to help you prepare for your next interview. What is Android? Android is an open-source mobile operating system developed by Google. It is based on the Linux kernel and designed primarily for touchscreen mobile devices such…

As computers age, their performance inevitably degrades, and the operating system becomes less responsive. This can be frustrating for users who want to continue using their old hardware but are limited by the resources available. Fortunately, Linux offers a variety of lightweight distros that are optimized for older computers, allowing them to run more smoothly and efficiently. In this article, we will review the 10 best lightweight Linux distros for old computers, along with their pros and cons. 1. Puppy Linux Puppy Linux is one of the smallest and lightest Linux distros available. It can run entirely from a USB…

DevOps has become an essential practice for software development and deployment in modern businesses. DevOps emphasizes collaboration, communication, and continuous improvement across development and operations teams to deliver software changes quickly and reliably. In this article, we have discussed 20 common DevOps interview questions and answers to help you prepare for your next interview. You should also read: 20 Common Job Interview Questions And Answers 20 Common Linux Interview Questions and Answers What is DevOps and how does it differ from traditional software development? Answer: DevOps is a culture and set of practices that emphasizes collaboration and communication between development…

QA (Quality Assurance) is a critical function in the software development process that ensures that products and services meet the highest standards of quality. As such, QA professionals play a vital role in software development organizations. Aspiring QA professionals must prepare themselves for the interview process to increase their chances of securing a job. In this article, we will discuss 20 common QA interview questions and the best answers to help you prepare for your next interview. You should also read: 20 Common Job Interview Questions And Answers What is your understanding of Quality Assurance? Answer: Quality Assurance is the…

In programming, modulus or remainder is the operation that returns the remainder of a division. In Bash, the modulus operator is represented by the % symbol. The modulus operator is commonly used in programming to check if a number is divisible by another number or to perform operations that require a cyclic pattern. In this article, we will explore how to use the modulus operator in Bash. Syntax: The syntax of the modulus operator in Bash is as follows:

Where num1 and num2 are the two numbers being operated on. The % symbol represents the modulus operator. Example 1:…