Author: Rahul

Zsh is a powerful shell that provides a wide range of features and functionalities to enhance the user’s experience. One of the key features of Zsh is its support for special variables, which allow users to perform various tasks easily and efficiently. In this article, we will explore some of the most useful special variables in Zsh and discuss how they can be used to improve your shell scripts. $0 – Get the running script name The $0 variable in Zsh refers to the name of the current script or shell being executed. This variable is particularly useful when you…

Sed, short for “stream editor”, is a powerful text-processing tool that is commonly used in Linux and Unix systems. It can perform a wide range of operations on text files, including searching, replacing, inserting, and deleting lines. One common task that users often need to perform with Sed is uncommenting lines in a text file. In this article, we’ll provide a guide to mastering Sed and using it to uncomment lines in text files. Before we dive into the specifics of using Sed to uncomment lines, let’s first define what we mean by “uncommenting.” In programming, a comment is a…

Disk Input/Output (I/O) is a critical aspect of system performance in Linux environments. Efficiently monitoring and managing disk I/O is essential for system administrators, as it enables them to identify potential bottlenecks, troubleshoot performance issues, and optimize their systems. This comprehensive guide will cover various tools and techniques to monitor disk I/O in Linux systems. 1. Understanding Disk I/O Disk I/O refers to the process of reading data from or writing data to a storage device, such as a hard disk or solid-state drive. High disk I/O can lead to slow system performance and impact overall user experience. Monitoring disk…

Sending emails is an essential task for system administrators, and PowerShell makes it simple to automate this process using remote SMTP. In this article, we will provide you with a PowerShell script that will send an email through remote SMTP. This script will allow you to send emails automatically, without having to do it manually, saving you time and improving your productivity as a system administrator. By creating this PowerShell script, you can automate your email sending process, and ensure that the messages are sent quickly and efficiently, without having to worry about typing out the same email over and…

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…