mt - magnetic tape control
mt [-f tapename] command... [count]
The mt utility sends commands to a magnetic tape drive. If
-f tapename is not specified, the environment variable TAPE
is used. If TAPE does not exist, mt uses the device
The following option is supported:
Specifies the raw tape device.
The following operands are supported:
count The number of times that the requested operation is to
be performed. By default, mt performs command once.
Multiple operations of command may be performed by
Available commands that can be sent to a magnetic tape
drive. Only as many characters as are required to
uniquely identify a command need be specified.
Write count EOF marks at the current position on the
fsf Forward space over count EOF marks. The tape is posi-
tioned on the first block of the file.
fsr Forward space count records.
bsf Back space over count EOF marks. The tape is posi-
tioned on the beginning-of-tape side of the EOF mark.
bsr Back space count records.
nbsf Back space count files. The tape is positioned on the
first block of the file. This is equivalent to count+1
bsf's followed by one fsf.
asf Absolute space to count file number. This is
equivalent to a rewind followed by a fsf count.
If count is specified with any of the following commands,
the count is ignored and the command is performed only once.
eom Space to the end of recorded media on the tape. This
is useful for appending files onto previously written
Rewind the tape.
Rewind the tape and, if appropriate, take the drive
unit off-line by unloading the tape. It cycles
through all four tapes.
Print status information about the tape unit.
Rewind the cartridge tape completely, then wind it
forward to the end of the reel and back to beginning-
of-tape to smooth out tape tension.
Allow the tape drive to remain reserved after closing
the device. The drive must then be explicitly
Re-establish the default behavior of releasing at
Break the reservation of the tape drive held by
another host and then reserve the tape drive. This
command can be executed only with super-user
erase Erase the entire tape. Erasing a tape may take a long
time depending on the device and/or tape. Refer to the
device specific manual for time details.
0 All operations were successful.
1 Command was unrecognized or mt was unable to open the
specified tape drive.
2 An operation failed.
magnetic tape interface
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWcsu |
tar(1), tcopy(1), ar(3HEAD), environ(4), attributes(5),
mtio( 7I), st(7D)
Not all devices support all options. Some options are
hardware-dependent. Refer to the corresponding device manual
mt is architecture sensitive. Heterogeneous operation (that
is, SPARC to x86 or the reverse) is not supported.
Man(1) output converted with