User`s guide

COPY
Value Operation
If the handler finds the sequence number value, it creates a new
logical end-of-tape. If there are any files with a sequence number
greater than value, they are lost.
-1 The handler goes to the logical end-of-tape and enters the file you
specify. It does not rewind and it does not check for duplicate file
names.
-2 The tape rewinds between each copy operation. The handler enters
the file you specify at the logical end-of-tape or at the first occurrence
of a duplicate file name (but if the handler enters the file over the
duplicate file, you lose everything after that file).
See the PIP utility chapter in the RT–11 System Utilities Manual for more
detailed information about operations involving magtape.
/PREDELETE
Deletes a file on the output device that has the same file name and type as a file
you copy to that device, before the copy occurs. Normally RT–11 deletes a file of
the same file name and type after the copy operation successfully completes.
This option is useful for operations involving devices that have limited space,
such as diskettes.
Warning: When you use the /PREDELETE option, if for any reason the input
file is unreadable, the output file will already have been deleted and you are left
with no usable version of the file.
/PREDELETE is invalid with magtape as output.
/[NO]PROTECTION
/PROTECTION gives an output file protected status so that it cannot be deleted.
Note that if a file is protected, you cannot perform any operations on the file that
result in its deletion. You can copy a protected file to another volume, change its
name, or write to it. However, you cannot delete a protected file; you must first
change its protection status by using the /NOPROTECTION option.
If during a copy operation neither the /PROTECTION nor the /NOPROTECTION
option is specified, the output file retains the protection status of the input file.
/NOPROTECTION enables an output file for deletion. When you use the
/NOPROTECTION option during a COPY operation, the resulting output file
is enabled for deletion.
Files that have been assigned as logical disks are protected. You should not use
this option to remove protection from an active logical-disk file.
RT–11 Command Descriptions 53