type
Display information about command type.

type
-a, Display all location containing an executable named NAME; includes aliases, builtins, and functions, if and only if the ‘-p’ option is not also used.
–f, suppress shell function lookup.
type
type -t
-t, Output a single word which is one of ‘alias’, ‘keyword’, ‘function’, ‘builtin’, ‘file’ or ‘’, if NAME is an alias, shell reserved word, shell function, shell builtin, disk file, or not found, respectively.