Quick Reference

Quick reference cards and cheat sheets for lookup during daily work.

Topics

Topic	Description
ASCII Table	Character codes, control characters, CLI lookups
Exit Codes	Standard Unix/POSIX exit codes, signals, sysexits.h
HTTP Status Codes	1xx-5xx response codes with debugging tips
MIME Types	Content types for text, application, image, and certificates
Ports	Well-known and registered network ports
Regex Cheatsheet	Character classes, quantifiers, groups, lookaround, common patterns
Shortcuts	Keyboard shortcuts for terminal, tmux, and editors

Topic

Description

Character codes, control characters, CLI lookups

Standard Unix/POSIX exit codes, signals, sysexits.h

1xx-5xx response codes with debugging tips

Content types for text, application, image, and certificates

Well-known and registered network ports