<$mt:CategoryBasename$>
Produces the dirified basename defined for the category in context.
Attributes
default
A value to use in the event that no category is in context.
separator
Valid values are dash “-” (default) and underscore “_”. Specifying an underscore will convert any dashes to underscores. Specifying a dash will convert any underscores to dashes.
Example
If the basename of the category “News & Press” is news_press then this tag will output the dashed version news-press:
<$mt:CategoryBasename separator="-"$>
For an overview of how to use category tags like mt:CategoryBasename, check out Managing Categories in Movable Type.