There is a naming scheme used by io.directories. Operations for deleting and copying files come in two forms:

•	Words named operation-file which work on regular files only.
•	Words named operation-tree works on directory trees recursively, and also accepts regular files.

Deleting directory trees recursively:

delete-tree ( path -- )

Copying directory trees recursively:

copy-tree ( from to -- )

copy-tree-into ( from to -- )

copy-trees-into ( files to -- )