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Articles on Trending Technologies
Technical articles with clear explanations and examples
Process Memory Management in Linux
Process memory management is a crucial aspect of any operating system. In Linux, the memory management system is designed to efficiently manage memory usage, allowing processes to access and use memory they require while preventing them from accessing memory they do not own. Process Memory Layout Every Linux process has a standardized memory layout divided into distinct segments: Linux Process Memory Layout Stack High Address Unused Heap Data (BSS) ...
Read MoreBash if elif else Statement A Comprehensive Tutorial
The Bash if-elif-else statement is a fundamental control structure that allows you to execute different blocks of code based on conditions. This conditional construct enables you to create decision-making logic in your Bash scripts, making them more dynamic and responsive to different scenarios. What is Bash if-elif-else Statement? The Bash if-elif-else statement evaluates conditions sequentially and executes the code block associated with the first true condition. If a condition is true, the corresponding code block runs and the remaining conditions are skipped. If none of the conditions are true, the else block executes (if present). Syntax of ...
Read MoreMechanism for building Distributed file system
A Distributed File System (DFS) is a file system that allows multiple clients to access and share files stored across various servers in a network. Building a DFS requires careful integration of several key components including file servers, metadata management, directory services, file access protocols, replication mechanisms, caching strategies, and security measures. Distributed File System Architecture The architecture of a DFS consists of interconnected components that work together to provide seamless file access across the network. The system is designed with multiple file servers, each storing portions of the distributed files, connected through a network infrastructure. ...
Read MoreHow to Get Root and User SSH Login Email Alerts?
Secure Shell (SSH) is a widely used protocol for securely connecting to remote systems over unsecured networks. It provides a secure channel for communication between two systems, allowing users to execute commands and manage files on remote machines without the risk of eavesdropping, tampering, or identity theft. However, despite its strong security features, SSH is still vulnerable to attacks from cybercriminals who seek to exploit weak passwords, unpatched software vulnerabilities, or misconfigured permissions. Therefore, it's essential to take proactive measures to secure your SSH access by implementing email alerts for login attempts. Setting up Email Alerts for Root ...
Read MoreCrontab Reboot_ How to Execute a Job Automatically at Boot?
Crontab is a widely used tool for scheduling tasks on Linux systems. It provides a simple way to automate routine tasks, such as backups, system maintenance, and data processing. While crontab typically schedules tasks based on specific time intervals, you can also execute jobs conditionally when certain conditions are met, such as when a file is created or when a process is running. This article demonstrates how to use crontab to execute jobs conditionally and automatically at system boot on Linux systems. Step 1: Identify the Condition The first step is to identify the condition that triggers ...
Read MoreHow to Configure PAM to Audit Logging Shell User Activity?
In today's digital age, security is of utmost importance. The rise of cyber threats and data breaches has shown that no system is completely safe. System administrators and IT professionals must take proactive measures to protect their systems and data. One such measure is the use of Pluggable Authentication Modules (PAM) for user authentication. PAM is a powerful tool that allows system administrators to customize the authentication process for their systems. It enables the use of multiple authentication methods, such as passwords, tokens, and biometrics, among others. This flexibility makes it easier for administrators to manage access controls and ...
Read MoreHow to invert a grep expression on Linux?
The grep command in Linux is used to filter searches in a file for a particular pattern of characters. It is one of the most used Linux utility commands to display the lines that contain the pattern that we are trying to search. To invert a grep expression means to display all lines that do NOT match the specified pattern, which is accomplished using the -v option. Basic Grep Syntax grep [options] pattern [files] Common Grep Options -c : Lists only a count of the lines that match a pattern -h : Displays ...
Read MoreWhat are the interrupt stages and processing?
The instruction cycle in a computer system consists of three main stages: fetch, execute, and interrupt handling. When an interrupt occurs during program execution, the CPU must temporarily suspend its current task to handle the interrupt request efficiently. Instruction Cycle with Interrupt Handling FETCH EXECUTE INTERRUPT Return to Fetch Interrupt? ...
Read MoreIntroduction to File MIME Types on Linux
MIME types (Multipurpose Internet Mail Extensions) are a crucial aspect of Linux file management, as they enable the operating system to identify file formats and determine the appropriate program for opening each file. Understanding MIME types is beneficial when dealing with various file formats on Linux systems, enhancing productivity and improving the overall user experience. What are MIME Types? MIME types are standardized identifiers that describe the nature and format of files. They consist of a type and subtype separated by a slash, such as text/plain or image/jpeg. Linux uses these identifiers to associate files with appropriate applications ...
Read MoreCPU Scheduling Criteria
CPU scheduling is the process of determining which process or task is to be executed by the central processing unit (CPU) at any given time. It is an important component of modern operating systems that allows multiple processes to run simultaneously on a single processor. The CPU scheduler determines the order and priority in which processes are executed and allocates CPU time accordingly, based on various criteria such as CPU utilization, throughput, turnaround time, waiting time, and response time. Efficient CPU scheduling is crucial for optimizing system performance and ensuring that processes are executed in a fair and timely manner. ...
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