From the NannyMUD documentation

LAST CHANGE

2000-12-08

COMMAND

NAME
        unset - Clear an environment variable.


LOCATION
	Wizmod, module 'default'.

SYNTAX
	unset 

DESCRIPTION
	This command unsets a variable in the wizmod.


SEE ALSO
        set in std/module/default/set


SEE ALSO
        setenv in wizcommands/misc/setenv


SEE ALSO
        unsetenv in wizcommands/misc/unsetenv