Usr
/usr is a core macOS Unix directory containing commands, libraries, and shared resources used by the system and many apps.
What is Usr?
The /usr folder is a standard Unix directory that macOS uses for system-provided command-line tools, libraries, executables, headers, and shared resources. People often encounter it when using Terminal, development tools, package managers, or troubleshooting software that relies on Unix-style paths. On modern macOS, important parts of /usr are protected by the operating system, though some subfolders such as /usr/local may also be used by developer tools and third-party software.
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Safety overview
Status: Use with caution
This is a critical system location. Removing or altering files in /usr can break command-line tools, developer environments, apps, or macOS itself. Some subfolders may contain third-party components, but they should be reviewed individually rather than treating the whole /usr directory as removable.
Recommendation: Keep /usr. Do not try to delete or clean this folder as a whole. If you are investigating disk usage or unused software, review specific subfolders or items separately, especially third-party additions such as /usr/local, and only after confirming what installed them.
File path
/usr
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