MT(1) BSD Reference Manual MT(1)
mt - magnetic tape manipulating program
mt [-f tapename] command [count]
Mt is used to give commands to a magnetic tape drive. By default mt per-
forms the requested operation once. Operations may be performed multiple
times by specifying count. Note that tapename must reference a raw (not
block) tape device.
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 (Count is ig-
status Print status information about the tape unit.
If a tape name is not specified, and the environment variable TAPE does
not exist; mt uses the device /dev/rmt12.
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 by mt.
TAPE Mt checks the TAPE environment variable if the argument
tapename is not given.
/dev/rmt* Raw magnetic tape interface
dd(1), ioctl(2), environ(7)
The mt command appeared in 4.3BSD.
4th Berkeley Distribution June 6, 1993 1