mt - magnetic tape manipulating program
mt [-f tapename] command [count]
mt [-t tapename] command [count]
mt is used to give commands to the tape drive. If tapename is not
specified, the environment variable TAPE is used; if TAPE is not
defined, the default drive is used.
mt winds the tape in the requested direction (forward or backward),
stopping after the specified count EOF marks or records are passed.
If count is not specified, one is assumed. Each EOF mark counts as
one record. When winding backwards, the tape always stops at the BOT
marker, regardless of the number remaining in count.
mt accepts the following commands:
eof Write count EOF marks.
fsf Forward space count files.
fsr Forward space count records.
bsf Backward space count files.
bsr Backward space count records.
rew Rewind tape.
offl Rewind tape and go offline.
eod Seek to end of data (DDS and QIC drives only).
smk Write count setmarks (DDS drives only).
fss Forward space count setmarks (DDS drives only).
bss Backward space count setmarks (DDS drives only).
status Print status information about the tape drive.
res Reserve tape drive for sole use by the host issuing the
mt command (stape driver only).
rel Release tape drive from sole use by the host issuing
the mt command (stape driver only).
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
Spacing operations (back or forward space file or record) leave the
tape positioned past the object being spaced to in the direction of
motion. That is, backspacing a file leaves the the tape positioned
before the file mark, forward spacing a file leaves the tape
positioned after the file mark. This is consistent with all classical
usage on tapes.
Only raw, no-rewind Berkeley-type devices should be specified. This
type of device will not reposition the tape upon close. An example of
such a device is /dev/rmt/0mnb. Please refer to mt(7) for more
It is possible to wind the tape beyond the EOT marker and off the end
of the reel.
A reservation may only be cleared with a release by the host that
issued the original reserve. In the event that the host that holds the
reservation is no longer available, the st command may be used to
reclaim the device by issuing a bus device reset. Refer to st(1M) for
The reserve/release functionality can only be issued to drives using
the stape driver.
Rewind the tape associated with the device file /dev/rmt/0mnb:
mt -f /dev/rmt/0mnb rew
/dev/rmt/* Raw magnetic tape interface
/dev/rmt/0mnb Default tape interface
mt was developed by the University of California, Berkeley.
dd(1), mt(7), st(1M).
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000