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dpkg is a low-level package management system for Debian-based Linux distributions like Ubuntu, Debian, and Linux Mint. It handles the installation, removal, and management of .deb package files directly. While higher-level tools like apt and apt-get provide dependency resolution, dpkg focuses on the core operations of package handling. What is the dpkg Command? The dpkg command is responsible for the fundamental package management tasks such as unpacking archives, installing files, configuring packages, and maintaining the package database. It operates at a lower level than tools like apt, giving administrators direct control over individual package operations without automatic dependency ... Read More
The concepts of stimulus and response events play a crucial role in understanding how systems and programs interact with each other and with their environment. These terms are often used in the context of event-driven programming, where software components respond to various events triggered by user actions or other system events. In this article, we will explore the fundamental differences between stimulus and response events and delve into their significance in computer science. What are Stimulus Events? Stimulus events can be thought of as triggers or inputs that initiate a particular action or behavior within a system. These ... Read More
Cron is a utility in Linux that allows users to schedule commands or scripts to run automatically at a specific date and time. However, sometimes it may be necessary to ensure that a cron job does not run more than once at a time, preventing resource conflicts or data corruption. In this article, we will discuss two effective methods to prevent overlapping cron tasks: using process tracking and using a .pid file. Method 1: Process Detection with pgrep One way to avoid overlapping cron task execution is to check for the presence of the task's process before running ... Read More
CMake is an open-source cross-platform tool used for building, testing and packaging software. It is widely used in industry for its portability and ability to generate build scripts for various build systems such as make, ninja, etc. Qt5 is a cross-platform application development framework that is widely used in creating GUI applications. In this article, we will discuss a common issue that developers face while configuring a CMake project on Linux: CMake configure fails to find Qt5. Understanding the Issue When we configure a CMake project with Qt5, CMake needs to find the Qt5 package, which includes required ... Read More
Remote Desktop is a handy tool that allows you to access your computer from a different location, using another device. It is very useful, especially for remote workers, who need to access their work computer from home or any other location. The most common way to access a remote desktop is through a client software installed on the device, but there is an easier way to access it: using a browser. In this article, we will show you how to access remote desktop from a browser using TightVNC. What is TightVNC? TightVNC is a free remote control software ... Read More
Python and Perl are two popular programming languages used for a variety of purposes. Both languages have their own strengths and weaknesses, and choosing between them can be a difficult decision for aspiring programmers. In this article, we will take a deep dive into the Python vs Perl debate and help you make an informed decision on which language to learn. Python vs Perl: An Overview Python and Perl are both high-level, interpreted programming languages that are used for a wide range of applications. Python was created in the late 1980s by Guido van Rossum, while Perl was ... Read More
The kernel is the core component of an operating system that acts as a bridge between applications and the hardware. It is the first program loaded after the boot loader and remains in memory until the system shuts down. When a process needs to access hardware resources, it makes a system call to the kernel. Functions of Kernel The kernel performs several critical functions − Process management − Creating, scheduling, and terminating processes Memory management − Allocating and deallocating memory for processes Device management − Managing hardware devices and device drivers File system management − Handling ... Read More
NGINX is a high-performance web server that requires monitoring for optimal performance. The NGINX Status Page is a built-in module that provides real-time metrics about server activity, including active connections, request counts, and server uptime. This feature helps system administrators monitor performance, identify bottlenecks, and troubleshoot issues efficiently. Understanding NGINX Status Page The NGINX status page displays real-time performance data through the stub_status module. This lightweight monitoring tool provides essential metrics without significantly impacting server performance. Key Metrics Displayed The status page shows several important metrics − Active Connections − Current number of client ... Read More
Kernel is the main part of an Operating System. It is the first program that is loaded after the boot loader whenever we start a system. The Kernel is present in the memory until the Operating System is shut-down. Kernel provides an interface between the user and the hardware components of the system. Whenever a process makes a request to the Kernel, then it is called System Call. Functions of Kernel The functions of the kernel are as follows − Process management Access computer resources Device management Memory management Interrupt handling I/O communication ... Read More
In Linux, hidden files (also called dotfiles) are files whose names begin with a dot (.) character. These files typically store configuration data or system settings that should be handled carefully. When you need to move all files from a subdirectory to its parent directory, including these hidden files, Linux provides several effective methods. Using the mv Command The mv command is the standard tool for moving files and directories from one location to another. It can also be used to rename files and directories. Moving Visible Files Only To move all visible files from a ... Read More