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1993-05-03
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MT(1) USER COMMANDS MT(1)
NAME
mt - magnetic tape control
SYNOPSIS
mt [ -f tapename ] command [ count ]
DESCRIPTION
mt sends commands to a magnetic tape drive. If tapename is
not specified, the environment variable TAPE is used. If
TAPE does not exist, mt uses the device TAPE$.
tapename refers to a raw tape device. By default, mt per-
forms the requested operation once; multiple operations may
be performed by specifying count.
The available commands are listed below. Only as many char-
acters as are required to uniquely identify a command need
be specified.
mt returns a 0 exit status when the operation(s) were suc-
cessful, 1 if the command was unrecognized or if mt was
unable to open the specified tape drive, and 2 if an opera-
tion failed.
OPTIONS
eof, weof Write count EOF marks at the current position
on the tape.
fsf Forward space over count EOF marks. The tape is
positioned on the first block of the file.
fsr Forward space count records.
bsf Back space over count EOF marks. The tape is
positioned 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.
For the following commands, count is ignored:
eom Space to the end of recorded media on the tape.
This is useful for appending files onto previ-
ously written tapes.
rewind Rewind the tape.
offline, rewoffl
Rewind the tape and, if appropriate, take the
drive unit off-line by unloading the tape.
status Print status information about the tape unit.
retension 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.
erase Erase the entire tape.
reset Reset the tape drive.