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Enable and disable builtin shell commands.
Syntax
enable [-n] [-p] [-f filename] [-ads] [name ...]

Options
-a list each builtin with an indication of whether or not
it is enabled.

-d Delete a builtin loaded with `-f?.

-f load the new builtin command name from shared object filename,
on systems that support dynamic loading.

-n Disable the names listed, otherwise names are enabled.

-p Print a list of shell builtins, default if no name arguments appear
With no other arguments, the list consists of all enabled shell builtins.

-s Restrict to enable only POSIX special builtins
Disabling a builtin allows a disk command which has the same
name as a shell builtin to be executed without specifying a full pathname, even
though the shell normally searches for builtins before disk commands.

For example, to use the test binary found via $PATH
instead of the shell builtin version, type `enable -n test?.

If there are no options, a list of the shell builtins is displayed.

If `-s? is used with `-f?, the new builtin becomes a special builtin.

The return status is zero unless a name is not a shell builtin or there
is an error loading a new builtin from a shared object.

You see things; and you say ?Why?? But I dream things that never were; and
I say ?why not?? - George
Bernard Shaw