.undef

Calling .undef with the name of a directive removes that directive from use. If the given directive is not known, nothing is done.

Example -- Preventing system calls

The following example un-defines the system directive, .$.

.undef{$}

Example -- Ruining user experience

The .undef directive can be used to remove all directives from availability.

.foreach{d}{.known-directives}:
	.undef{!d}