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.
hash -r is what needs to be done. In zsh it is rehash and rehash doesn't exist (by default) in bash.
I use both shells and rehash has been reinforced in my hind-brain for decades, it comes out of my fingers without asking. To accommodate those reflexes I have added
alias rehash='hash -r' to my
.aliases_bash file, which I test for and source from
To summarize, in
.bashrc I use the line:
[[ -f ~/.aliases_bash ]] && . ~/.aliases_bash
/.aliases_bash I use the line
alias rehash='hash -r'