1 03/27/84  backup_preattach
 2 
 3 Syntax:   backup_preattach open_mode attach_description
 4     or:   backup_preattach -detach
 5 
 6 
 7 Function: attaches and detaches the I/O switch used by the backup_dump
 8 and backup_load subsystems with a specified attach description, so
 9 that input and output media or devices other than tapes may be used by
10 the backup subsystem.
11 
12 
13 Arguments:
14 open_mode
15    is either "input" or "output", indicating the mode in which the
16    switch will be opened (input for backup_load, output for
17    backup_dump).
18 attach_description
19    is an attach description for reading or writing the backup
20    data. A switch with this attachment will be used by the backup
21    subsystem.
22 
23 
24 Control arguments:
25 -detach
26    Causes the previously pre-attached switch to be detached. The
27    backup subsystem will revert to using tapes after -detach is
28    specified.
29 
30 
31 Examples:  To create a vfile_ containing the image of a hierarchy and
32 then reload it somewhere else:
33     backup_preattach output "vfile_ dump_file"
34     backup_dump >udd>Project
35     backup_preattach -detach
36     backup_preattach input "vfile_ dump_file"
37     backup_load