This article introduces awk as a versatile text‑processing language, explains its origins and variants, details command‑line syntax and three invocation methods, and walks through practical examples—from extracting fields in system files to using built‑in variables, conditionals, loops, arrays, and formatted output with print and printf.
This article introduces sed as a powerful stream editor for text processing, explains its pattern‑space workflow, details command syntax, addressing methods, options, meta‑characters, and provides numerous concrete examples—including deletions, substitutions, range selections, multi‑command scripts, and file I/O operations—illustrating how each feature works in practice.
This comprehensive guide lists essential Linux commands across ten categories—including file management, document editing, file transfer, disk management, network communication, system management, and backup—providing a quick-reference cheat sheet for system administrators and power users.
This guide explains how to use the Unix cut command to extract specific columns or character ranges from files or streams, detailing the -d, -f, and -c options with clear examples such as selecting fields from colon‑separated data.
This article lists the main top‑level directories in a typical Linux filesystem—such as bin, sbin, etc, usr, home, root, dev, lib, mnt, boot, tmp, and var—and explains the purpose of each directory.
This guide provides concise syntax, descriptions, common options, and practical examples for essential Linux commands such as cat, chattr, chmod, chown, cp, ln, locate, lsattr, mv, rm, tee, touch, umask, whereis, and which, helping users efficiently manage files and system attributes from the command line.
The article traces the evolution of minicomputers from IBM's RISC‑based Power series and proprietary UNIX systems through a competitive era of closed architectures, to the modern shift toward open X86‑based platforms, highlighting how open standards, Linux and Intel’s strategies reshaped the market and reduced customer risk.
This tutorial explains how to view and modify Linux/Unix file permissions using the chmod command, covering numeric and symbolic modes, common options, and multiple practical examples ranging from simple read‑only settings to recursive directory permission changes.
A shebang (#!) line placed at the start of a script tells the operating system which interpreter to use, can include optional arguments, and may employ the env command to locate the executable, with variations such as hashbang, pound‑bang, and hash‑pling.
This article provides a concise collection of practical sed command examples, demonstrating how to print, delete, substitute, and transform lines and characters in a text file using regular expressions, including techniques for case conversion, line numbering, and in‑place editing.
The article revisits the historic Y2K panic and explains how the same kind of overflow, known as the 2038 Unix bug, threatens Linux systems as their 32‑bit time counters will roll over on January 19, 2038, potentially causing widespread date‑related failures.
This article demystifies Bash's test constructs—including test, [, [[, and (( ))—explaining their syntax, return codes, common operators, and practical examples so readers can confidently write conditional logic in shell scripts.
This article compiles 73 practical Linux shell tips covering network checks, process control, file manipulation, system monitoring, version control, and various command-line shortcuts, providing concise examples and commands to enhance productivity and troubleshooting for system administrators and developers.
Discover five surprisingly useful Unix commands—man ascii, cal, xxd, ssh, and mdfind—along with clear examples, output snippets, and practical tips that reveal hidden capabilities for everyday terminal work.
This article explains the Unix philosophy of keeping things simple, detailing how tools should do one job well and how data streams, redirection, and pipelines combine commands to create powerful yet straightforward command‑line workflows.
This tutorial walks you through creating a simple iterative Python web server, demonstrates its single‑request limitation, explains socket fundamentals, and then shows how to transform it into a concurrent server using the Unix fork() system call while handling backlog, duplicate descriptors, and zombie processes.
Learn how to list all processes, filter by user, sort by CPU or memory usage, display top results, and visualize process hierarchies using Linux's ps command suite, with clear examples and screenshots to help you master system monitoring.
This article provides a comprehensive overview of Linux environment variables, common and special variables, Bash shell fundamentals, login script execution order, variable manipulation techniques, and essential built‑in commands, helping readers understand and effectively use shell scripting on Unix‑like systems.
This article explains the purpose of the Unix xargs command, demonstrates basic usage for concatenating log files, shows an advanced example for renaming text files to log files using the -I placeholder, and provides a step‑by‑step breakdown of how the command pipeline works.
This comprehensive guide explains how to use the powerful lsof command to list open files, inspect network connections, filter by users, processes, ports, and hosts, and apply advanced options for system monitoring and security troubleshooting on Unix-like systems.
This article explains the design principles, working mechanisms, installation steps, and common issues of syslog-ng and daemontools, showing how to configure syslog-ng for fine‑grained filtering, run it under daemontools supervision, and resolve a daemon restart loop.
This article explains the Unix principle that everything is a file, describes regular and special file types, outlines why and how disks are partitioned, introduces mount points, and details the standard Linux filesystem hierarchy and inode metadata.
This guide presents a collection of practical Unix/Linux command-line techniques—including safe file deletion, terminal session recording, directory restoration, permission management, output formatting, user information retrieval, and efficient navigation—to help users boost productivity and manage systems more effectively.
The Unix grep command, created by Ken Thompson before the fourth edition of Unix and named after the ed editor’s “g/re/p” syntax, first appeared in Version 4, later expanded by Al Aho into egrep and fgrep, and was popularized through the GNU and BSD implementations, illustrating Unix’s collaborative evolution.
The author recounts how a university encounter and later work demands led them to master Unix, using tools like awk, Perl, Python and Ruby to automate massive data tasks, teach courses, and champion Ubuntu and other Unix-like systems as essential, productivity‑driving platforms.
This article clarifies Unix I/O models by distinguishing synchronous and asynchronous operations, explaining blocking versus non‑blocking behavior, and summarizing the five classic I/O models with practical insights drawn from Richard Stevens' authoritative definitions.
The article presents a curated Chinese‑language reading list for application operations and system administration, dividing essential titles into technical culture, core technical, and peripheral works, and recommending classics such as The Pragmatic Programmer, Unix Super Tools, Continuous Delivery, Mastering Regular Expressions, Ruby Metaprogramming, and even interdisciplinary books like The Zen of Presentation and Approaching Chinese Medicine.
