mt, eject - magnetic tape and removable media manipulating
mt [-f device] command [count]
eject [-f] device
The mt utility sends commands to a magnetic tape drive. By
performs the requested operation once. Operations may be
times by specifying count. Note that device must reference a raw
(not block) tape device. If device is of the form
``user@host:device'', mt writes to the named tape device on
host using rmt(8). eject is simply an alias for mt, with
command specified. eject may also be used to eject other
types of removable
The options are as follows:
Operate on the device specified.
If the -f flag is passed to eject, it is silently ignored.
The available commands are listed below. Only as many characters as are
required to uniquely identify a command need be specified.
eof, weof Write count end-of-file marks at the current position on the
fsf Forward space count files.
fsr Forward space count records.
bsf Back space count files.
bsr Back space count records.
rewind Rewind the tape (count is ignored).
Rewind the tape and place the tape unit off-line
ignored). On non-tape removable media, the
causes the media to be ejected when the last operation on it
closes (i.e., the filesystem is unmounted).
status Print status information about the tape unit.
retension Retension the tape (if this operation is supported by the tape
erase Erase the tape (if this operation is supported by
eom Forward space to the end of the media.
blocksize Set the tape blocksize to count bytes.
density Set the tape density code to count as specified
in the SCSI2
If a tape name is not specified, and the environment variable TAPE does
not exist, mt uses the device /dev/rst0. The TAPE variable
is ignored by
mt returns a 0 exit status when the operation(s) were successful, 1 if
the command was unrecognized, and 2 if an operation failed.
If the following environment variable exists, it is utilized
TAPE mt checks the TAPE environment variable if the
device is not given.
/dev/rst* raw SCSI tape interface
/dev/rmt* raw magnetic tape interface
/usr/src/sys/scsi/scsi_tape.h list of SCSI2 density codes
$ eject /dev/rcd0c
Eject the first CD device. This will work even if there is
no CD in the
dd(1), ioctl(2), mtio(4), environ(7)
The mt utility appeared in Version 2 AT&T UNIX.
OpenBSD 3.6 June 12, 1996
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