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2026.04.25 4 min read ⚙ Essays 📚 Defining Moments in Software History 📚 Incidents That Brought the Internet to a Halt Software History Open Source DevOps

Incidents That Brought the Internet to a Halt — Moments When a Tiny Piece of Code Shook Global Infrastructure

The internet seems like a unified system, but it is built on countless small pieces of code and dependencies. This article shows how tiny components—like left-pad, Log4Shell, and Heartbleed—can disrupt global infrastructure and reveals the true nature of the software ecosystem we rely on.

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2026.03.31 30 min read 🎯Docs 📚 Complete Guide to Linux Shell Execution Linux Shell DevOps

Complete Guide to Linux PATH and Environment Variables — How Executables Are Located

When you run a command in Linux, how does the shell actually find the executable? This article explains how PATH and environment variables work, how command lookup is performed, and why export and path order matter in real execution flow.

2026.03.30 15 min read 🎯Docs 📚 Complete Guide to Linux Shell Execution Linux Operating Systems DevOps

Complete Guide to Linux Signals — SIGINT, SIGTERM, and the Principles of Process Control

Signals are not just a way to kill processes. They are the core mechanism for controlling process lifecycle in Linux. This article explains how SIGINT, SIGTERM, and SIGKILL differ, and why graceful shutdown matters in real systems.

2026.03.28 21 min read 🎯Docs Linux Shell DevOps 📚 Complete Guide to Linux Shell Execution

Linux nohup Fully Explained — How to Keep Processes Running After Terminal Exit

nohup keeps a process running after the terminal closes by ignoring SIGHUP. This post explains what nohup really changes, why it is usually paired with `&`, how logging works, and where its limits begin in real operations.

2026.03.27 6 min read 🎯Docs 📚 Linux I/O and Data Flow — From Streams to Pipelines Linux Shell DevOps

Why grep, sort, and uniq Are Piped Together — The Core Pattern for Log Analysis

grep | sort | uniq is not just a command chain but a data processing pattern. It filters, groups, and aggregates text efficiently. This post explains why sort is essential before uniq and how the pipeline works in real scenarios.

2026.03.27 10 min read 🎯Docs Linux Shell DevOps 📚 Linux I/O and Data Flow — From Streams to Pipelines

What Is a Pipe (|)? A Clear Guide to the Linux Pipe Concept

Linux pipes (|) are not just simple syntax. They are a core concept for connecting commands and building a flow of data. Through a range of practical examples, you can clearly understand how pipes work and how to use them effectively.