ZERO

	ZERO is a program for zeroing a dectape directory, a user directory
or a user disk pack directory.

	The general format of the command is:

		ZERO {<device name>{:}}

	If then argument is omitted, a star is printed and the device  name
will now be accepted. The colon is optional. If the device is not a dectape,
disk, or user disk pack, you will get an eror message and another star.


DECTAPES:

	The system uuo "UTPCLR" is issued which zeroes all file entries  in
the dectape directory and sets the last used block as block 1.


DISK:

	You are asked if you really want to zero  you  disk  area,  if  you
answer anything but "Y", the program exits. Otherwise an attempt is made to
delete each file in the current user directory. If the attempt is succesful
a  "#"  is  printed. If not, the filename, extension and reason for failure
are printed. If all files were successfully deleted and you  now  log  out,
LOGOUT will delete the UFD for this area.


USER DISK PACK:

	You are asked for the write access password for this UDP.  If  you
don't  know  it, you won't get any farther. Then you are asked if you want
to initialize the COPY type directory. This is in general done  only  once
to  any  UDP,  an usually by an expert. It intializes the first 2 block of
the UDP so that COPY may simulate a file  structure  there.  Now  you  are
asked  if you want to change the UDP write password. If you answer "Y" you
are asked for the new password which is then written on the  disk  by  the
system. That's all.