whereis probably works just fine, there are just no binaries named Notes or XCode in your $PATH . For confirmation, please try to run which Notes and which XCode . Also try whereis man to confirm that whereis is actually working.

Does locate work on Mac?

The locate command is very useful if you're looking to track down every instance of a file, filetype, app, extension, things hidden deep in system folders, or just about anything else that Spotlight can't manage.

How do I enable path on Mac?

A window displays a summary of information about the items. Show the path to a file or folder: On your Mac, click the Finder icon in the Dock to open a Finder window, then choose View > Show Path Bar. The location and nested folders that contain your file or folder are displayed near the bottom of the Finder window.