Command reference and developer cheat sheets
Find common syntax and examples for Excel formulas, Linux, Python, Docker, regular expressions, HTTP status codes and SQL.
A quick reference for everyday commands
When coding, deploying services or analyzing data, a forgotten command can interrupt your work. This reference brings common syntax, options and examples from seven areas together on one page.
Browse Excel data formulas, Linux file and service commands, Python string and list operations, Docker image and container commands, regular expressions, HTTP status codes and SQL queries. Entries focus on useful syntax with short examples you can adapt.
Seven categoriesExcel, Linux, Python, Docker, regex, HTTP status codes and SQL on one page
Common operations firstFind frequently used syntax without browsing obscure options
Practical examplesCommands and functions include examples you can adapt to your task
Quick browsingCategory tabs help you find the right reference quickly
Easy to bookmarkSave one page as a compact reference for future work
| Category | Typical use | Examples |
|---|---|---|
| Excel formulas | Everyday data processing | VLOOKUP, SUMIF, TEXT |
| Linux commands | Server and file management | grep, find, chmod, systemctl |
| Python functions | Scripting and data analysis | join, replace, sorted, lambda |
| Docker | Container deployment | build, run, exec, compose |
| Regular expressions | Text matching and extraction | \d+, [a-z], (capture) |
| HTTP status codes | API debugging | 200, 301, 404, 500 |
| SQL | Database queries | SELECT, JOIN, GROUP BY |
Who is this reference for?
Developers, system administrators, data analysts and anyone who works with data can use these cheat sheets. They are a quick reminder of syntax, rather than a complete textbook.
- Choose a category at the top, such as Linux commands
- Browse or search for a command, such as grep
- Review the example, copy it to your terminal or document and adjust paths and options before running it
- Bookmark the page for future reference
Which languages and tools are covered?
The reference covers Excel formulas, Linux commands, Python functions, Docker, regular expressions, HTTP status codes and SQL, with common entries for development, operations and data processing.
How do I find a regular expression?
Expressions are organized by common tasks, such as matching digits, email addresses or text, and extracting parenthesized content. Entries include syntax and an example to test.
Can I bookmark this page?
Yes. The reference uses local static data and needs no login. Bookmark the URL to return to it later.
Will the content be updated?
We add useful commands, functions and examples in response to common needs and feedback.
Privacy: This reference searches local data in your browser. Search terms and tool inputs are not uploaded to a server.