whence

Interpret `command`, with expansion if defined as an `alias` (similar to the `command -v` builtin)

Display type of `command`, with location if defined as a function or binary (equivalent to the `type` and `command -V` builtins)

Same as above, except display content of shell functions instead of location (equivalent to `which` builtin)

Same as above, but show all occurrences on command path (equivalent to the `where` builtin)

Search only the `$PATH` for `command`, ignoring builtins, aliases, or shell functions (equivalent to the `where` command)