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Articles on Trending Technologies
Technical articles with clear explanations and examples
Linux who Command with Examples
The Linux who command is a fundamental system utility that displays information about users currently logged into the system. It shows login names, terminal devices, login times, and remote host information. This command is essential for system administrators to monitor active user sessions and track system access. Basic Usage The simplest form of the who command displays all currently logged-in users: who user1 pts/0 2021-12-20 10:01 (192.168.1.100) user2 pts/1 2021-12-20 10:03 (192.168.1.101) admin ...
Read MoreProtection in OS: Domain of Protection, Association, Authentication
The Operating System manages various application programs loaded into memory after system boot. The OS provides security methods to protect processes from unauthorized access and manages resources across both logical and physical address spaces, including CPU, internal memory, and disk storage. Protection mechanisms ensure confidentiality and integrity of these critical resources. Protection in OS In multi-user environments, securing data from unauthorized processes and external access is essential. The OS implements access control mechanisms that define which users or processes can perform read, write, or execute operations on specific resources. Protection addresses common threats including viruses, worms, Trojan horses, ...
Read MoreNot Recently Used (NRU) page replacement algorithm
The Not Recently Used (NRU) page replacement algorithm is a fundamental memory management technique used by operating systems to efficiently manage page replacement in virtual memory systems. Its primary goal is to identify and remove pages from memory that have not been accessed recently, making room for new pages when physical memory becomes full. How NRU Algorithm Works NRU uses two hardware bits associated with each page − a reference bit (R) and a modified bit (M). The reference bit is set when the page is accessed (read or written), and the modified bit is set when the ...
Read MoreLinux zcat Command with Examples
The zcat command in Linux is a tool for displaying the contents of compressed files in the gzip format. It functions like the cat command but is specifically designed for working with compressed files. The command reads compressed files and outputs their uncompressed content to standard output without modifying the original compressed file. Syntax zcat [options] file.gz [file2.gz ...] Basic Usage To view the contents of a compressed file, use the following command − zcat example.txt.gz This displays the uncompressed contents of example.txt.gz directly in the terminal without extracting the ...
Read MoreWebmin Alternatives
Webmin is a web-based system administration tool used to manage UNIX and Linux systems, servers, and services through a browser interface. It allows administrators to configure users, disk quotas, system files, and open-source applications like Apache HTTP Server, BIND DNS Server, and PHP without command-line expertise. Why Look for Webmin Alternatives? While Webmin is functional, it has several limitations that drive administrators to seek alternatives − Security concerns − Frequent security vulnerabilities require constant updates Limited features − Fewer capabilities compared to modern control panels Complex installation − Requires additional repositories and manual configuration Outdated interface ...
Read MoreProtection ring
Protection rings are a security mechanism used by operating systems to control access to system resources and hardware. These rings create a hierarchical privilege structure, with each ring having different levels of access permissions. The central ring (Ring 0) at the kernel level has the highest privilege and can access all resources, while outer rings have progressively fewer permissions. This mechanism is hardware-enforced by the CPU architecture at different access modes. The x86 processor architecture implements four protection rings (Ring 0 to Ring 3), where Ring 0 has the highest privilege level and Ring 3 has the lowest. ...
Read MoreLongest Remaining Time First (LRTF) CPU Scheduling Program
Longest Remaining Time First (LRTF) is a preemptive CPU scheduling algorithm that selects the process with the longest remaining burst time to execute next. Unlike Shortest Remaining Time First (SRTF), LRTF prioritizes processes that will take the most time to complete, making it a variant of the Longest Job First (LJF) algorithm. How LRTF Works The scheduler maintains a ready queue and continuously selects the process with the maximum remaining execution time. When a new process arrives, the scheduler compares its burst time with the currently executing process and may preempt if the new process has a longer ...
Read MoreProcess Contention Scope vs System Contention Scope
Process Contention Scope (PCS) and System Contention Scope (SCS) are two fundamental threading models that define how threads compete for CPU resources in operating systems. These concepts determine the scheduling domain where thread contention occurs and directly impact system performance and resource allocation strategies. Resource contention occurs when multiple threads compete for the same CPU time simultaneously. The contention scope defines the boundary within which this competition takes place − either among threads within a single process or among all threads system-wide. Process Contention Scope (PCS) In Process Contention Scope, threads compete for CPU resources only among ...
Read MoreLossless Real-Time Data Compression with Zstandard (zstd)
Zstandard (zstd) is a high-performance, lossless data compression algorithm developed by Yann Collet. It provides excellent compression ratios while maintaining fast compression and decompression speeds, making it ideal for real-time data processing. Zstd is open-source and supports various data types including text, images, audio, and video files across multiple platforms including Linux, Windows, macOS, and FreeBSD. The algorithm uses advanced techniques like entropy coding and dictionary compression to achieve superior performance compared to traditional compression methods. Its adaptive nature allows it to optimize compression based on data patterns, making it particularly effective for repetitive data structures. Key Features ...
Read MoreRequirements of Linux System Administrator
Linux is a type of operating system that is used in many computers, acting as a common platform between hardware and software applications. It is implemented not only in servers and workstations but also in mobile devices, embedded systems, and cloud infrastructure. Linux OS can be installed and used for free as it comes under open source licensing. The Linux System Administrator is a critical position in Information Technology (IT) organizations, responsible for maintaining, configuring, and securing Linux-based systems that form the backbone of modern enterprise infrastructure. Linux System Administrator Role A Linux System Administrator is a specialized ...
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