ires@kaspar.UUCP (Bruce R. Larson) (11/29/90)
I've been looking for a portable `rewind' to use in shell scripts,
and I may have found (or more likely, reinvented) the perfect solution.
I am posting this because it answers the rewind question raised in FAQ #5.
Here are a couple of Bourne shell functions to
i) rewind the tape device, and
ii) advance to the next archive on the tape.
TAPE=dev/tape
NTAPE=/dev/ntape
rewind_tape(){
dd if=$TAPE of=/dev/null count=0 2>/dev/null
}
advance_tape(){
dd if=$NTAPE of=/dev/null count=0 2>/dev/null
}
It works for me!
Bruce
Bruce R. Larson | The drug problem in the US is so
Integral Resources, Milton MA | vast that we need to recognize that
Internet: ires.com!blarson@cs.umb.edu | it is primarily a social problem,
Uucp: ..!cs.umb.edu!ires.com!blarson| not a criminal problem.
-- tneff@bfmny0.BFM.COM (Tom Neff) (11/30/90)
That's overkill. To rewind: :</dev/tape To advance: :</dev/ntape but keep in mind that the specific device names vary according to vendor. (I.e. here it's /dev/rmt/c0s0 and /dev/rmt/c0s0n.)
ires@kaspar.UUCP (Bruce R. Larson) (12/01/90)
In article <16081@bfmny0.BFM.COM>, tneff@bfmny0.BFM.COM (Tom Neff) writes: > > To rewind: > > :</dev/tape > > To advance: > > :</dev/ntape > > but keep in mind that the specific device names vary according to > vendor. (I.e. here it's /dev/rmt/c0s0 and /dev/rmt/c0s0n.) > Not only was my rewind overkill, but it had a problem with SCSI tape drives. Your's is much nicer. Thanks for sharing it. Bruce Bruce R. Larson | The drug problem in the US is so Integral Resources, Milton MA | vast that we need to recognize that Internet: ires.com!blarson@cs.umb.edu | it is primarily a social problem, Uucp: ..!cs.umb.edu!ires.com!blarson| not a criminal problem. -- Bruce R. Larson | The drug problem in the US is so Integral Resources, Milton MA | vast that we need to recognize that Internet: ires.com!blarson@cs.umb.edu | it is primarily a social problem, Uucp: ..!cs.umb.edu!ires.com!blarson| not a criminal problem.
richard@pegasus.com (Richard Foulk) (12/05/90)
> >To rewind: > > :</dev/tape > Or, to be portable between shells: echo < /dev/tape
root@ninja.dell.com (Randy Davis) (12/06/90)
In article <1990Dec5.114754.229@pegasus.com> richard@pegasus.com (Richard Foulk) writes: |(someone else wrote): |>To rewind: |> :</dev/tape |Or, to be portable between shells: | echo < /dev/tape Or, how about just "< /dev/tape" - works just as well and should be just as portable... Randy Davis UUCP: rjd@ninja.dell.com --