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mt(1) [bsd man page]

MT(1)							      General Commands Manual							     MT(1)

NAME
mt - magnetic tape manipulating program SYNOPSIS
mt [ -f tapename ] command [ count ] DESCRIPTION
Mt is used to give commands to a magnetic tape drive. If a tape name is not specified, the environment variable TAPE is used; if TAPE does not exist, mt uses the device /dev/rmt12. Note that tapename must reference a raw (not block) tape device. By default mt performs the requested operation once. Operations may be performed multiple times by specifying count. The available commands are listed below. Only as many characters as are required to uniquely identify a command need be specified. eof, weof Write count end-of-file marks at the current position on the tape. fsf Forward space count files. fsr Forward space count records. bsf Back space count files. bsr Back space count records. rewind Rewind the tape (Count is ignored). offline, rewoffl Rewind the tape and place the tape unit off-line (Count is ignored). status Print status information about the tape unit. cacheon Enable the readahead/writebehind cache on the tape unit. cacheoff Turn off the readahead/writebehind cache on the tape unit. Mt returns a 0 exit status when the operation(s) were successful, 1 if the command was unrecognized, and 2 if an operation failed. The cacheon and cacheoff commands currently only apply to the TMSCP driver and then only for certain drives such as the TU81+. No error is produced by the TMSCP driver if the cache commands are used. Other drivers will return an error code since they do not recognize the MTCACHE and MTNOCACHE functions codes. See mtio(4). FILES
/dev/rmt* Raw magnetic tape interface SEE ALSO
mtio(4), tmscp(4), dd(1), ioctl(2), environ(7) 4th Berkeley Distribution December 22, 1995 MT(1)

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mt(1)							      General Commands Manual							     mt(1)

NAME
mt - magnetic tape manipulating program SYNOPSIS
tapename] command [count] Obsolescent tapename] command [count] DESCRIPTION
is used to give commands to the tape drive. If tapename is not specified, the environment variable is used; if is not defined, the default drive is used. winds the tape in the requested direction (forward or backward), stopping after the specified count EOF marks or records are passed. If count is not specified, one is assumed. Each EOF mark counts as one record. When winding backwards, the tape always stops at the BOT marker, regardless of the number remaining in count. accepts the following commands: Write count EOF marks. Forward space count files. Forward space count records. Backward space count files. Backward space count records. Rewind tape. Rewind tape and go offline. Seek to end of data (DDS and QIC drives only). Write count setmarks (DDS drives only). Forward space count setmarks (DDS drives only). Backward space count setmarks (DDS drives only). Print status information about the tape drive. Reserve tape drive for sole use by the host issuing the command (stape or estape driver only). Release tape drive from sole use by the host issuing the command (stape or estape driver only). Spacing operations (back or forward space file or record) leave the tape positioned past the object being spaced to in the direction of motion. That is, backspacing a file leaves the the tape positioned before the file mark, forward spacing a file leaves the tape positioned after the file mark. This is consistent with all classical usage on tapes. WARNINGS
Only raw, no-rewind Berkeley-type devices should be specified. This type of device will not reposition the tape upon close. An example of such a device is or See mt(7) for more details. It is possible to wind the tape beyond the EOT marker and off the end of the reel. A reservation may only be cleared with a release by the host that issued the original reserve. In the event that the host that holds the reservation is no longer available, the command may be used to reclaim the device by issuing a bus device reset. See st(1M) for more details. The reserve/release functionality can only be issued to drives using the or driver. EXAMPLES
Rewind the tape associated with the device file or (if legacy DSF is disabled): FILES
Raw magnetic tape interface (stape) Raw magnetic tape interface (estape) Default tape interface. If legacy DSF is disabled, the default value is AUTHOR
was developed by the University of California, Berkeley. SEE ALSO
dd(1), st(1M), intro(7), mt(7). mt(1)

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