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The BACKSPACE command moves a magnetic tape set backward over a
specified number of files or records.
@BACKSPACE (DEVICE) dev: n units
dev: is the name of the tape set or magnetic tape drive that
you want to move backward. The colon after the device
name is optional.
n is the number of files or records over which you want
Default n - 1
units is either FILES or RECORDS.
Default units - FILES
BACKSPACE with Open Files
If you have given a CTRL/C to exit from a program that has opened
a magnetic tape drive and you then give the BACKSPACE command for
that tape drive, the system will first ask if you want to close
the associated file. You must do so for BACKSPACE to succeed,
but you will probably be unable to continue the program from that
point because the file will now be closed.
RECORDS Argument Used for Unlabeled Tapes Only
You cannot give the RECORDS argument to the BACKSPACE command
when using a labeled tape, because read and write operations for
labeled tapes always move the tape to the beginning of a file
For moving a magnetic tape set forward.
For backspacing a tape volume or tape set to its logical
beginning (the beginning of the first file).
For completely rewinding a magnetic tape onto the source
1. Backspace your magnetic tape one file.
@BACKSPACE MTA0: 1 FILE