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mt (1)
  • >> mt (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • mt (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • mt (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • mt (7) ( Solaris man: Макропакеты и соглашения )
  •  

    NAME

    mt - magnetic tape control
     
    

    SYNOPSIS

    mt [-f tapename] command... [count]
    

     

    DESCRIPTION

    The mt utility sends commands to a magnetic tape drive. If -f tapename is not specified, the environment variable TAPE is used. If TAPE does not exist, mt uses the device /dev/rmt/0n.  

    OPTIONS

    The following options are supported:

    -f tapename

    Specifies the raw tape device.

     

    OPERANDS

    The following operands are supported:

    count

    The number of times that the requested operation is to be performed. By default, mt performs command once. Multiple operations of command can be performed by specifying count.

    command

    The following available commands that can be sent to a magnetic tape drive are supported. Only as many characters as are required to uniquely identify a command need be specified.

    asf

    Specifies absolute space to count file number. This is equivalent to a rewind followed by a fsf count.

    bsf

    Back spaces over count EOF marks. The tape is positioned on the beginning-of-tape side of the EOF mark.

    bsr

    Back spaces count records.

    bssf

    Back spaces over the requested number of sequential file marks. Sequential file marks are where the file marks are one right after the other with no other blocks of any kind between the file marks. The number argument specifies how many sequential file marks to which to space. For example, bssf 4 searches backwards to the first place where there are 4 sequential file marks and positions to the BOP side of the 4th file mark.

    This command is not supported by all drives.

    eof
    weof

    Writes count EOF marks at the current position on the tape.

    fsf

    Forward spaces over count EOF marks. The tape is positioned on the first block of the file.

    fsr

    Forward spaces count records.

    fssf

    Forward spaces the over requested number of sequential file marks. Sequential file marks are where the file marks are one right after the other with no other blocks of any kind between the file marks. The number argument specifies how many sequential file marks to which to space. For example, fssf 4 searches forwards to the first place where there are 4 sequential file marks and positions after the 4th file mark.

    This command is not supported by all drives.

    load

    Requests drive load and thread current media. Not supported by all drives.

    lock

    Prevents media removal.

    nbsf

    Back spaces count files. The tape is positioned on the first block of the file. This is equivalent to count+1 bsfs ollowed by one fsf.

    seek

    Positions to requested logical tape position.

    tell

    Gets and prints current logical tape position.

    unlock

    Allows media removal.

    If count is specified with any of the following commands, the count is ignored and the command is performed only once.

    config

    Reads the drives current configuration from the driver and displays it in st.conf format. See st(7D) for definition of fields and there meanings.

    eom

    Spaces to the end of recorded media on the tape. This is useful for appending files onto previously written tapes.

    erase

    Erases the entire tape.

    Some tape drives have option settings where only portions of the tape can be erased. Be sure to select the correct setting to erase the whole tape. Erasing a tape can take a long time depending on the device and/or tape. Refer to the device specific manual for time details.

    forcereserve

    Attempts to break a SCSI II reserve issued by another initiator. When this command completes, the drive is not reserved for the current initiator, but is available for use. This command can be only be executed by those with super-user privileges.

    offline
    rewoffl

    Rewinds the tape and, if appropriate, takes the drive unit off-line by unloading the tape.

    release

    Re-establishes the default behavior of releasing at close.

    reserve

    Allows the tape drive to remain reserved after closing the device. The drive must then be explicitly released.

    retension

    Rewinds the cartridge tape completely, then winds it forward to the end of the reel and back to beginning-of-tape to smooth out tape tension.

    rewind

    Rewinds the tape.

    status

    Prints status information about the tape unit.

    Status information can include the sense key reported by the drive, the residual and retries for the last operation, the current tape position reported in file number, and the number of blocks from the beginning of that file. It might also report that WORM media is loaded in that drive.

     

    EXIT STATUS

    0

    All operations were successful.

    1

    Command was unrecognized or mt was unable to open the specified tape drive.

    2

    An operation failed.

     

    FILES

    /dev/rmt/*

    magnetic tape interface

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    AvailabilitySUNWcsu

     

    SEE ALSO

    tar(1), tcopy(1), ar.h(3HEAD), attributes(5), mtio(7I), st(7D)  

    BUGS

    Not all devices support all options. Some options are hardware-dependent. Refer to the corresponding device manual page.

    mt is architecture sensitive. Heterogeneous operation (that is, SPARC to x86 or the reverse) is not supported.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    OPTIONS
    OPERANDS
    EXIT STATUS
    FILES
    ATTRIBUTES
    SEE ALSO
    BUGS


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