UnixRef

UnixRef is an offline guide to essential Unix commands across macOS and Linux.

Find the command you need, choose the operating system you’re using, and see the matching syntax, options, subcommands, availability notes, and source documentation. UnixRef keeps BSD/macOS and GNU/Linux variants separate so you don’t accidentally use the wrong flags.

Built for iPhone, iPad, Mac, Apple Watch, and Apple Vision Pro:

• Browse 200+ commands across files, text, networking, processes, users, packages, storage, and system tools
• Filter to macOS, Linux, or all supported systems
• Search by command name or description
• Save favorites and quickly revisit recent commands
• Add private per-command notes with UnixRef Pro and sync them through iCloud
• Keep a command within easy reach with configurable widgets
• Open commands through Siri, Shortcuts, Spotlight, deep links, and Handoff
• Read the core reference offline, including on Apple Watch

Whether you’re learning the terminal, writing a shell script, administering a server, or checking a flag away from your desk, UnixRef keeps the reference close.