DUP

Syntax DUP
Location Toolkit II

This command strips off the last part of the default data device, thus moving up the directory tree. If the default program device is the same as the default data device, then this will also be altered by DUP. If the default destination device is a directory device (ie. if it ends with an underscore), DUP also alters this (whether or not it points to another drive).

win1_
win1_C_
win1_C_include_
win1_C_objects_
win1_BASIC_
win1_QUILL_
win1_QUILL_letters_
win1_QUILL_translations
win1_secret_

If DATAD$ is win1_, DDOWN Quill moves down to win1_Quill_, whilst DUP will move DATAD$ back up to win1_.

If DATAD$ is win1_Quill_letters_secret_, three DUPs will change it back to win1_.

NOTE

It is not possible to move beyond the name specifying the actual device to be used. In the above example, this is the named root, win1_.

CROSS-REFERENCE

DATA_USE allows you to set the absolute directory root, DDOWN goes down the tree, and DNEXT skips from branch to branch. DATAD$ returns the current default data device ie. the device name plus the current sub-directory.