Reference & Lookups

Complete reference of all HTTP status codes — searchable with descriptions.

Searchable lookup of file extensions and their MIME / content types.

Searchable list of well-known network ports and the services that use them.

Searchable reference of CIDR prefixes, subnet masks, host counts and private IP ranges.

Searchable reference of common HTTP request and response headers and what they do.

Searchable reference of HTTP request methods (GET, POST, PUT, DELETE…) with safety, idempotency and caching notes.

Searchable reference of common Unix/Linux shell exit codes, signals, and BSD sysexits.

Searchable reference of ISO country codes, calling codes and ISO currency codes.

Searchable reference of common Git commands for branching, undoing, stashing and more.

Searchable reference of common Linux/Unix shell commands grouped by task.

Searchable reference of common Docker and Docker Compose commands for images, containers, volumes and networks.

Searchable reference of common kubectl commands for managing Kubernetes pods, deployments, services and more.

Searchable reference of common Vim commands for modes, movement, editing, search and windows.