TOPS-20 Commands Reference Manual

REWIND

Returns a magnetic tape to its load point (logical beginning, the beginning of the first file).

Format

@REWIND (DEVICE) dev:  /switch

where:

dev:

is the name of the tape set or magnetic tape drive that you want to rewind. The colon after the device name is optional.

/switch

is one of the following:

/CURRENT-VOLUME-ONLY

rewinds tape set to beginning of currently mounted volume

/ENTIRE-VOLUME-SET

rewinds tape set to beginning of first volume Default - ENTIRE-VOLUME-SET

Note:

these switches can be used only for devices of the form MTn:, not MTAn:.

Restrictions

REWIND with Open Files

If you have given a CTRL/C to exit from a program that has opened a magnetic tape set and you then give the REWIND command for that tape set, the system will first ask if you want to close the associated file. You must do so for REWIND to succeed, but will probably be unable to continue the program from that point because the file will now be closed.

Related Commands

BACKSPACE	for moving a magnetic tape backward a specified number of files or records
DIRECTORY	(when used with a magnetic tape device) for rewinding a tape set, printing a directory of its files, and again rewinding the tape set
SKIP	for moving a magnetic tape forward a specified number of files or records
UNLOAD	for rewinding a magnetic tape completely onto the source reel

Examples

Rewind your magnetic tape.
```
@REWIND DAY:
```

Mount a tape, and prepare to copy files onto it. (Use the REWIND command to be sure you are at the beginning.) After copying the files, rewind the tape and (using the COPY command) read the first one. Then give TOPS-20 commands to free the resources you have been using.

@MOUNT TAPE DAY:
[Mount Request DAY Queued, Request-ID 183]
[Tape set DAY, volume DAY mounted]
[DAY: defined as MT0:]
@MOUNT STRUCTURE SNARK:
Structure SNARK: mounted
@ACCESS SNARK:
@REWIND DAY:
@COPY SNARK:FIL-1.TAP DAY:
 SNARK:FIL-1.TAP.1 => MT0:FIL-1 [OK]
@COPY SNARK:FIL-2.TAP DAY:
 SNARK:FIL-2.TAP.1 => MT0:FIL-2 [OK]
@COPY SNARK:FIL-3.TAP DAY:
 SNARK:FIL-3.TAP.1 => MT0:FIL-3 [OK]
@REWIND DAY:
@COPY DAY: TTY:
 MT0: => TTY:

!THIS IS THE FIRST FILE.!
@DISMOUNT TAPE DAY:
[Tape dismounted, logical name DAY: deleted]
@END-ACCESS SNARK:
@DISMOUNT STRUCTURE SNARK:
Structure SNARK: dismounted
@

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