linux: What does hash -r do?

linux: What does hash -r do?The hash utility shall affect the way the current shell environment remembers the locations of utilities found as described in Command Search and Execution. Depending on the arguments specified, it shall add utility locations to its list of remembered locations or it shall purge the contents of the list. When no arguments are specified, it shall report on the contents of the list.

The following option shall be supported:

-r: Forget all previously remembered utility locations.

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