Bookmarkable cheat sheets for the syntax and commands you look up most.
Linux file permissions, chmod commands, and notation guide.
Cron syntax, fields, schedules, and debugging reference guide.
Glob patterns and wildcard syntax reference guide.
HTML entities, escape characters, and symbols reference guide.
MySQL commands, queries, syntax, and management reference.
Regular expressions syntax, patterns, and practical examples.
Quick copy-paste commands to fix and undo Git mistakes.
HTTP status codes, meanings, and common error explanations.
Common MIME types and Content-Type reference guide.