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BASH (Bourne Again Shell) is a Unix shell and command language widely used in Linux and Unix-like operating systems. One powerful feature of BASH is the ability to create and use functions within script files. Functions are reusable blocks of code that perform specific tasks and can be executed from within the script or directly from the command line. Prerequisites Before we begin, you will need − A Linux system with a command line interface (or SSH access). A script containing a function you want to run (your custom script). The required permissions to execute the ... Read More
Docker Compose allows you to build multi-container Docker applications. If you are working on a microservice project where you have different nodes working on different parts of the project, Docker Compose is exactly what you need. Using Docker Compose, you can work on different components of the project on different Docker containers and combine them to create a single application. In this article, we are going to discuss how to build a Flask application which uses Python modules and we will try to run it inside a Docker container using Docker Compose. Installing Docker Compose First, you ... Read More
If you're new to Linux, learning shell scripting can seem daunting at first. However, shell scripting can be an incredibly useful skill to have when working with Linux systems. Shell scripts can automate repetitive tasks, perform system administration tasks, and even help with software development. In this article, we'll look at five essential shell scripts that Linux newbies can learn to get started with shell programming. We'll cover some basics of shell scripting, and provide examples of each script to help you understand how they work. What is Shell Scripting? A shell script is a program written ... Read More
Apache Tomcat is a popular open-source web server and servlet container that is widely used to deploy Java-based web applications. In this article, we will show you how to install and configure Apache Tomcat 9 on CentOS 8/7. Step 1: Install Java The first step to installing Apache Tomcat is to install Java. Tomcat requires a Java Development Kit (JDK) version 8 or later to be installed. You can check the installed Java version on your system by running the following command − java -version If Java is not installed on your system, you ... Read More
If you have a Docker container running and you want to copy files from the host machine to the Docker container, there are several ways to do it. One way to do this is by using the ADD or COPY instructions inside a Dockerfile and passing the paths of the files that you want to be in your container when you start it. But what happens if you already have a container running? It's not feasible to build the same image again and again just for a small file to be included in it. To avoid this fiasco, Docker ... Read More
Asymmetric multiprocessing (AMP) is a type of multiprocessor system where processors are assigned specific roles and are not treated equally. Unlike symmetric multiprocessing, where all processors can perform any task, asymmetric systems have a hierarchical structure with specialized processor functions. How Asymmetric Multiprocessing Works In asymmetric multiprocessing, processors have distinct roles and responsibilities. Typically, one processor acts as the master and controls the system, while other processors serve as slaves that handle specific tasks assigned by the master. Asymmetric Multiprocessing System Master ... Read More
Machine learning and Data Science have become essential technologies in modern computing. Organizations adopt Data Analytics and Machine Learning techniques to predict sales and increase revenue. If you want to build machine learning models in a dynamic and contained environment, Docker containers provide an excellent solution. You can build and run Machine Learning models easily inside Docker Containers with the help of Jupyter Notebooks. The containerized environment provides better version control of your Python or R libraries and packages used in Machine Learning projects. In this article, we will discuss how to create a simple NumPy Jupyter Notebook ... Read More
OpnSense is an open-source, easy-to-use firewall platform that provides robust network security solutions. It is based on FreeBSD and offers a user-friendly web interface for configuring and managing firewall rules, NAT, VPN, and other network services. Prerequisites Before installing OpnSense, ensure you have − A dedicated computer or virtual machine with at least 2GB RAM and 8GB storage At least two network interfaces (WAN and LAN) A USB drive (4GB or larger) for installation media Basic understanding of networking concepts Installation Process Step 1: Download OpnSense ISO Download the latest stable OpnSense ... Read More
To set Readline key bindings and variables in the Linux system, we use the bind command. The bind command is used to assign functions and macros to keys, allowing you to create hotkeys instead of typing entire commands. It is a shell built-in command available in bash. Syntax The syntax of the bind command is as follows − bind [-lpsvPSVX] [-m KEYMAP] [-f FILENAME] [-q NAME] [-u NAME] [-r KEYSEQ] [-x KEYSEQ:shell-command] While the general syntax appears complex, the bind command is simple to use and allows you to easily create custom key bindings ... Read More
Cache is a small, high-speed memory that stores frequently accessed data to reduce the time needed to retrieve information from slower storage devices. The process of storing and accessing data from a cache is known as caching. Cache memory acts as an intermediary between the CPU and main memory, significantly improving system performance. How Caching Works When the CPU needs data, it first checks the cache. If the data is found (called a cache hit), it's retrieved quickly. If not found (called a cache miss), the system fetches the data from main memory and stores a copy in ... Read More