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MT(1) GNU CPIO MT(1)
NAME
mt - control magnetic tape drive operation
SYNOPSIS
mt [-V] [-f device] [--file=device] [--rsh-command=command] [--version] operation [count]
DESCRIPTION
This manual page documents the GNU version of mt. mt performs the given operation, which
must be one of the tape operations listed below, on a tape drive.
The default tape device to operate on is taken from the file /usr/include/sys/mtio.h when
mt is compiled. It can be overridden by giving a device file name in the environment
variable TAPE or by a command line option (see below), which also overrides the environ-
ment variable.
The device must be either a character special file or a remote tape drive. To use a tape
drive on another machine as the archive, use a filename that starts with `HOSTNAME:'. The
hostname can be preceded by a username and an `@' to access the remote tape drive as that
user, if you have permission to do so (typically an entry in that user's `~/.rhosts'
file).
The available operations are listed below. Unique abbreviations are accepted. Not all
operations are available on all systems, or work on all types of tape drives. Some opera-
tions optionally take a repeat count, which can be given after the operation name and de-
faults to 1.
eof, weof
Write count EOF marks at current position.
fsf Forward space count files. The tape is positioned on the first block of the next
file.
bsf Backward space count files. The tape is positioned on the first block of the next
file.
fsr Forward space count records.
bsr Backward space count records.
bsfm Backward space count file marks. The tape is positioned on the beginning-of-the-
tape side of the file mark.
fsfm Forward space count file marks. The tape is positioned on the beginning-of-the-
tape side of the file mark.
asf Absolute space to file number count. Equivalent to rewind followed by fsf count.
seek Seek to block number count.
eom Space to the end of the recorded media on the tape (for appending files onto
tapes).
rewind Rewind the tape.
offline, rewoffl
Rewind the tape and, if applicable, unload the tape.
status Print status information about the tape unit.
retension
Rewind the tape, then wind it to the end of the reel, then rewind it again.
erase Perform long erase of tape. If count is 0, perform short erase of tape (some de-
vices do not support this).
mt exits with a status of 0 if the operation succeeded, 1 if the operation or device name
given was invalid, or 2 if the operation failed.
OPTIONS
-f, --file=device
Use device as the file name of the tape drive to operate on. To use a tape drive
on another machine, use a filename that starts with `HOSTNAME:'. The hostname can
be preceded by a username and an `@' to access the remote tape drive as that user,
if you have permission to do so (typically an entry in that user's `~/.rhosts'
file).
--rsh-command=command
Notifies mt that it should use command to communicate with remote devices instead
of /usr/bin/ssh or /usr/bin/rsh.
-V, --version
Print the version number of mt.
BUG REPORTS
Report bugs to <bug-cpio AT gnu.org>.
COPYRIGHT
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it. There is NO WARRANTY,
to the extent permitted by law.
MT January 28, 2014 MT(1)
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