# Usage To install a package (or **Formula** in Homebrew vocabulary) simply type: ``` brew install ``` To update Homebrew's directory of formulae, run: ``` brew update ``` To see if any of your formulas need to be updated: ``` brew outdated ``` To update a formula: ``` brew upgrade ``` Homebrew keeps older versions of formulas installed on your system, in case you want to roll back to an older version. That is rarely necessary, so you can do some cleanup to get rid of those old versions: ``` brew cleanup ``` If you want to see what formulae Homebrew would delete *without actually deleting them*, you can run: ``` brew cleanup --dry-run ``` To see what you have installed (with their version numbers): ``` brew list --versions ``` To search for formulas you run: ``` brew search ``` To get more information about a formula you run: ``` brew info ``` To uninstall a formula you can run: ``` brew uninstall ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://notes.mikaelsamvelian.com/macos-setup/homebrew/usage.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.