This example shows an excerpt from a command procedure that uses the
F$DIRECTORY function to save the current default directory setting. The
assignment statement equates the symbol SAVE_DIR to the current
directory. Then the SET DEFAULT command establishes a new default
directory. Later, the symbol SAVE_DIR is used in the SET DEFAULT
command that restores the original default directory.
Note that you can use the F$ENVIRONMENT function with the DEFAULT
keyword to return the default disk and directory. You should use the
F$ENVIRONMENT function rather than the F$DIRECTORY function in
situations involving more than one disk.