Developer Resources

Command cheat sheets for Linux, Ubuntu, Docker and Nginx, plus setup guides for Node.js, Python, Java, Go and more — all with one-click copy, handy for daily operations, deployments and local environment setup.

Linux & System Ops

Linux Basic Commands

A quick reference for everyday file, permission, process, network and archive commands on mainstream Linux distributions.

Ubuntu Common Commands

Frequently used Ubuntu commands for APT packages, systemd services, Netplan networking, disk mounts and UFW firewall.

LVM Common Commands

Create, mount, grow and remove physical volumes, volume groups and logical volumes, with XFS and ext4 grow differences.

systemd Service Config

Practical snippets from writing a service unit to enabling, logging, timers and drop-in overrides.

Containers & Cloud Native

Docker Common Commands

High-frequency commands for images, containers, Compose, networks and volumes, with run examples and cleanup warnings.

Dockerfile Snippets

Copy-ready snippets from a minimal image to multi-stage builds, layer caching, non-root users and slim images.

kubectl Common Commands

High-frequency commands for contexts, inspection, logs, rollouts and node maintenance, with risk notes.

Web Servers & Networking

Nginx Commands & Config Snippets

Common operations plus ready-to-paste snippets for static sites, reverse proxy, HTTPS, caching, rate limiting and SPAs.

curl Command Reference

Common parameter combos for HTTP requests, auth, debugging and resumable downloads in curl.

Databases & Caching

MySQL Common Commands

High-frequency commands for connections, queries, backups, grants and lock troubleshooting, with risk notes for locking and large tables.

Redis Common Commands

High-frequency commands for connections, keys, the five data types, troubleshooting and replication, with blocking and flush warnings.

CLI & Version Control

Git Common Commands

Frequently used commands for config, commits, branches, remotes, undo and history forensics, with warnings on rewriting shared history.

jq Common Commands

Practical jq recipes for reading, filtering, reshaping, aggregating and converting JSON from APIs and logs.

Language Environments

Node.js Setup Guide

Set up Node.js from scratch: install on Windows and Linux/macOS, switch versions with nvm or fnm, switch registries, enable pnpm, scaffold projects and fix common errors.

Python Setup Guide

Configure Python: the Windows installer and py launcher, managing versions with pyenv or uv, virtual environments, pip mirrors, scaffolding and common error fixes.

Java Setup Guide

Set up Java: install Temurin/OpenJDK, switch versions with SDKMAN, configure JAVA_HOME, switch Maven and Gradle repositories, scaffold projects and fix common errors.

Go Setup Guide

Set up Go: install on Windows, Linux and macOS, configure GOPROXY and checksum services, GOROOT/GOPATH, module projects, cross-compilation and common error fixes.

Rust Setup Guide

Set up Rust: install rustup with the MSVC dependency, manage toolchains and components, switch cargo mirrors, create projects, cross-compile and fix common errors.

C/C++ Setup Guide

Set up C/C++: MSVC build tools, MinGW-w64 and GCC/Clang, CMake projects, vcpkg dependency management, debuggers and common error fixes.

PHP Setup Guide

Set up PHP: install on Windows, Linux and macOS, enable extensions in php.ini, install Composer with a mirror, run the built-in server, debug and fix common errors.

C# / .NET Setup Guide

Set up .NET: install the SDK and pin versions, manage global tools, switch NuGet sources, scaffold from templates, debug and fix common errors.

Kotlin & Android Setup Guide

Set up Kotlin and Android: Android Studio, cmdline-tools and SDKs, ANDROID_HOME, Gradle mirrors, emulators, adb debugging and common error fixes.

Swift & iOS Setup Guide

Set up Swift and iOS: Xcode command line tools, Swift Package Manager, simulators and device debugging, the Linux toolchain and common error fixes.

Medical Imaging

DICOM Tag Reference

Common DICOM tags ordered by workflow: patient, image type, pixel data, windowing and VR rules.

DICOM Command Line Tools

Everyday DCMTK and dcm4che command line tools for dumping, converting, transferring and anonymizing files.