Linux and Unix mt command
Control a magnetic tape device.
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.
mt [-V] [-f device] [--file=device] [--rsh-command=command] [--version] operation [count]
|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.|
|-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.|
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.