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MT !!!MT NAME SYNOPSIS DESCRIPTION ---- !!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''. 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. fss (SCSI tapes) Forward space ''count'' setmarks. bss (SCSI tapes) Backward space ''count'' setmarks. wset (SCSI tapes) Write ''count'' setmarks at current position (only SCSI tape). eod, seod Space to end of valid data. Used on streamer tape drives to append data to the logical and of tape. setblk (SCSI tapes) Set the block size of the drive to ''count'' bytes per record. setdensity (SCSI tapes) Set the tape density code to ''count.'' The proper codes to use with each drive should be looked up from the drive documentation. drvbuffer (SCSI tapes) Set the tape drive buffer code to ''number.'' The proper value for unbuffered operation is zero and '' stoptions (SCSI tapes) Set the driver options bits to ''count'' for the device. The bits can be set by oring the following values: 1 to enable write buffering, 2 to enable asynchronous writes, 4 to enable read ahead, 8 to enable debugging output (if it has been compiled to the driver). stwrthreshold (SCSI tapes) The write threshold for the tape device is set to ''count'' kilobytes. The value must be smaller than or equal to the driver buffer size. seek (SCSI tapes) Seek to the ''count'' block on the tape. This operation is available on some Tandberg and Wangtek streamers and some SCSI-2 tape drives. tell (SCSI tapes) Tell the current block on tape. This operation is available on some Tandberg and Wangtek streamers and some SCSI-2 tape drives. densities (SCSI tapes) Write explanation of some common density codes to standard output. datcompression (some SCSI-2 DAT tapes) Inquire or set the compression status (on/off). If the ''count'' is one the compression status is printed. If the ''count'' is zero, compression is disabled. Otherwise, compression is enabled. The command uses the SCSI ioctl to read and write the Data Compression Characteristics mode page (15). ONLY ROOT CAN USE THIS COMMAND. __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'', ''/usr/bin/rsh'', or the command specified by the environment variable __MT_RSH__. ''-V, --version'' Print the version number of __mt__. ----
5 pages link to
mt(1)
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rmt(8)
Man1m
st(4)
TwoLetterCommands
ArkeiaNotes
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