MT

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 environment 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 operations optionally take a repeat count, which can be given after the operation name and defaults 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

Erase the tape.

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.