How to rehash executables in $PATH with bash

Question

The subject says it all, how to rehash the available executables available within one of the $PATHs after having changed things: e.g. removed a binary from one $PATH which is available in another $PATH, changed the $PATH-variable.

Answer 1

hash -r is what needs to be done. In zsh it is rehash and rehash doesn't exist (by default) in bash.