mt(1) [ultrix man page]
mt(1) General Commands Manual mt(1) Name mt - magnetic tape manipulating program Syntax mt [-f tapename] command [count] Description The command permits the operation of a magnetic tape drive. Options The -f flag option uses the specified tape device (next argument) in place of either that tape device defined by your TAPE environment variable (.login or .profile) or /dev/nrmt0h. Some operations may be performed multiple times by specifying count. By default, performs the requested operation once. The command argument defines the operation to be performed. Only as many characters as are required to uniquely identify a command need be specified. The following is a list of commands: bsf Backspace count files. bsr Backspace count records. cache Allows to use the cache buffer on a tape drive that has the cache buffer feature. clhrdsf Clear hardware/software problem. Works with tape drives which use the TMSCP tape controller interface This command is restricted to root access only. clserex Clear serious exception. Works with tape drives which use the TMSCP tape controller interface clsub Clear subsystem. Works with tape drives which use the TMSCP tape controller interface This command is restricted to root access only. eof, weof Write count end-of-file marks at the current position on the tape. eotdis Disable end-of-tape detection. When the end of tape is reached, the tape will run off the reel. Only the superuser can issue this command. The command remains in effect for the device until end-of-tape detection is enabled with the eoten command. eoten Enable end-of-tape detection. When the end-of-tape markers are reached, the tape is halted on the reel, between the two end-of-tape markers. Only the superuser can issue this command. The command remains in effect for the device until end-of-tape detection is disabled with the eotdis command. This is the default mode after a system boot. fsf Forward-space count files. fsr Forward-space count records. nocache Disables the use of the cache buffer for any tape drive that has the cache buffer feature. offline, rewoffl Rewind the tape and place the tape unit off-line. retension Retensions the tape. Retension means moving the tape one complete pass between EOT and BOT. rewind Rewind the tape. status Print status information about the tape unit. Examples This example shows how to rewind the tape mt -f /dev/rmt0l rewind This example shows how to backspace the tape nmt1h three files: mt -f /dev/nrmt1h bsf 3 This example shows how to write two end-of-file marks at the current position on tape nmt6h: mt -f /dev/nrmt6h eof 2 Return Values In shell scripts, returns a 0 exit status when the operation(s) were successful, 1 if the command was unrecognized, and 2 if an operation failed. Files /dev/rmt?h or /dev/rmt?l Raw magnetic tape interface with rewind when closed /dev/nmt?h or /dev/nmt?l Raw magnetic tape interface with no rewind when closed See Also dd(1), tar(1), ioctl(2), mtio(4), tms(4), environ(7) mt(1)
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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 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 Perform long erase of tape. If count is 0, perform short erase of tape (some devices 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@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)