Author: Rahul

AWS Systems Manager (SSM) Parameter Store provides a centralized and secure storage solution for managing your configuration data, secrets, and application settings. One of the key operations you might perform when working with SSM Parameter Store is retrieving the value of a parameter. In this article, we’ll demonstrate how to create an AWS Identity and Access Management (IAM) policy that grants access to the ssm:GetParameter action, allowing you to securely retrieve parameter values. Creating IAM Policy to Allow ssm:GetParameter To create an AWS Identity and Access Management (IAM) policy that allows the ssm:GetParameter action, you need to specify the required…

Homebrew is a popular package manager for MacOS, which allows users to easily install, update, and manage various software packages. However, over time, outdated and unnecessary packages may accumulate on your system, consuming valuable disk space and potentially causing conflicts or performance issues. In this article, we will provide a comprehensive guide to help you streamline your MacOS by removing outdated and unnecessary Homebrew packages. Step 1: Update Homebrew Before you begin the process of removing outdated packages, it is essential to ensure that Homebrew is up to date. This ensures that you have the latest information about package updates…

Shell scripting is a powerful tool for automating tasks and performing system operations in Unix and Linux environments. One common task that arises in shell scripting is checking if a string is neither empty nor composed solely of spaces. In this article, we will explore different methods to identify non-empty and non-space strings in shell scripts, enhancing your scripting skills and making your scripts more efficient and robust. Basics of String Manipulation in Shell Scripts Before diving into the methods of checking for non-empty and non-space strings, it is crucial to understand some basics of string manipulation in shell scripts.…

Swappiness is a Linux kernel parameter that controls the balance between swapping out idle processes and using available RAM memory. The default swappiness value in most Linux distributions is 60, which means the system starts swapping out processes when the available memory falls below 40%. However, this default value might not be suitable for all situations, and changing the swappiness value can improve system performance. In this article, we will discuss how to change the swappiness value in Linux. We will cover different methods to change the swappiness value temporarily and permanently. Temporary Change Swappiness Value To change the swappiness…

Securing your website or application is crucial in today’s digital landscape, and one way to ensure security is through the use of Secure Sockets Layer (SSL) certificates. SSL certificates provide encryption and authentication, ensuring that data transmitted between a client and server remains private and secure. In some cases, it may be necessary to create a self-signed SSL certificate, which can be useful for testing, development, or internal purposes. In this article, we’ll provide a step-by-step guide on how to create a self-signed SSL certificate using the Linux command line. Step 1: Install OpenSSL The first step in creating a…

In the world of Unix and Linux, Bash is a powerful and versatile shell that provides advanced scripting capabilities. One of the core features of Bash is parameter expansion, which is a method for transforming and manipulating the content of variables using the ${} syntax. In this article, we will dive into the various types of parameter expansions available in Bash and provide examples to illustrate their usage. 1. Basic Parameter Expansion The most basic form of parameter expansion is to simply use {variable} to reference the value of a variable. For example:

This script will output “Hello, John…

Bash (Bourne-Again SHell) is a popular Unix shell scripting language that provides numerous features for text manipulation, file management, and process control. One of the powerful features in Bash is command substitution, which allows users to capture the output of a command and use it as an input for another command or as a variable. In this article, we’ll dive deep into understanding the command substitution using $() in Bash, its uses, and best practices. Table of Contents What is Command Substitution? Syntax for Command Substitution Practical Examples of Command Substitution Command Substitution with Pipes and Redirection Best Practices for…

Bash scripting is an essential skill for system administrators, programmers, and anyone who wants to automate tasks on Unix-like systems. One of the powerful features of Bash scripting is command substitution, which allows you to execute a command within another command. This feature enables you to create dynamic and flexible scripts, making your automation tasks more efficient and effective. In this article, we will explore the concept of command substitution in Bash scripting, its syntax, and various use cases to help you better understand and apply this powerful feature in your scripts. 1. Understanding Command Substitution Command substitution is a…

Process substitution is a powerful feature in Bash that allows you to use the output of a command as if it were a file. This can be useful in a variety of situations, such as when you need to compare the output of two commands, or when you want to redirect the output of a command to another command. In this article, we will provide a comprehensive guide to process substitution in Bash, explaining its syntax, use cases, and some common pitfalls and limitations. 1. Understanding Process Substitution Process substitution is a feature in Bash that allows you to use…

Empty directories can serve as a useful organizational tool in software projects, especially when adhering to specific folder structures. However, Git, by design, does not track empty directories. This article will guide you through the process of efficiently adding and managing empty directories in your Git repository, ensuring that your desired folder structure is preserved. Understanding Git’s Handling of Empty Directories Git tracks files, not directories. Empty directories do not contain any files, and thus, Git does not recognize them when committing changes. In order to include an empty directory in your repository, you need to create a placeholder file…