mt
瑞兹 发表于 2021-02-06 09:04浏览次数：
在类似Unix的操作系统上，mt命令控制磁带设备。
On Unix-like operating systems, the mt command controls a magnetic tape device.
目录：
1 mt 运行系统环境
2 mt 描述
3 mt 语法
mt 运行系统环境
mt 描述
默认的磁带设备进行操作，从文件中提取/usr/include/sys/mtio.h当MT被编译。可以通过在环境变量 TAPE中指定设备文件名或使用命令行选项（请参见下文）来覆盖它，该选项也将覆盖环境变量。
该设备必须是字符专用文件或远程磁带驱动器。若要将另一台计算机上的磁带机用作存档，请使用以“ HOSTNAME： ”开头的文件名。主机名前面可以有一个用户名和一个@，以该用户的身份访问远程磁带驱动器（如果您具有这样做的权限）（通常是该用户的〜/ .rhosts文件中的一个条目）。
下面列出了可用的操作。接受唯一的缩写。并非所有操作在所有系统上均可用，或在所有类型的磁带机上均可用。某些操作可以选择重复计数，该计数可以在操作名称之后指定，默认为1。
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 file name 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 语法
mt [-V] [-f device] [--file=device] [--rsh-command=command] [--version] operation [count]
运作方式
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EOF，WEOF
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在当前位置写入计数EOF标记。
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fsf
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转发空间计数文件。磁带位于下一个文件的第一个块上。
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bsf
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向后空间计数文件。磁带位于下一个文件的第一个块上。
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fsr
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转发空间计数记录。
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bsr
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向后空间计数记录。
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bsfm
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向后空间计数文件标记。磁带位于文件标记的磁带开头侧。
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fsfm
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转发空间计数文件标记。磁带位于文件标记的磁带开头侧。
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asf
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文件号计数的绝对空间。等同于倒带，然后是fsf计数。
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seek
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寻求阻止号码计数。
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eom
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磁带上已记录媒体末尾的空间（用于将文件追加到磁带上）。
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rewind
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倒带。
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offline，rewoffl
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倒带，如果适用，请卸载带。
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status
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打印有关磁带机的状态信息。
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retension
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倒带，然后将其缠绕到卷轴的末端，然后再次倒带。
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erase
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擦除磁带。
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选件
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-f,--file =device
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使用设备作为操作磁带机的文件名。要在另一台计算机上使用磁带驱动器，请使用以“ HOSTNAME： ”开头的文件名。该主机可以通过用户名和前面“ @ ”来访问远程磁带驱动器作为用户，如果你有这样的权限（通常在该用户的“的条目〜/ .rhosts中”文件）。
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--rsh-command =command
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通知mt应该使用命令而不是/ usr / bin / ssh或/ usr / bin / rsh与远程设备通信。
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-V,--version
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打印mt的版本号。
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退出状态
mt退出时的状态0，如果操作成功，1如果给定的操作或设备名称是无效的，或者2 ;如果操作失败。
mt [-V] [-f device] [--file=device] [--rsh-command=command] [--version] operation [count]
Operations
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eof, weof
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Write count EOF marks at current position.
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fsf
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Forward space count files. The tape is positioned on the first block of the next file.
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bsf
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Backward space count files. The tape is positioned on the first block of the next file.
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fsr
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Forward space count records.
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bsr
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Backward space count records.
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bsfm
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Backward space count file marks. The tape is positioned on the beginning-of-the-tape side of the file mark.
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fsfm
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Forward space count file marks. The tape is positioned on the beginning-of-the-tape side of the file mark.
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asf
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Absolute space to file number count. Equivalent to rewind followed by fsf count.
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seek
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Seek to block number count.
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eom
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Space to the end of the recorded media on the tape (for appending files onto tapes).
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rewind
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Rewind the tape.
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offline, rewoffl
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Rewind the tape and, if applicable, unload the tape.
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status
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Print status information about the tape unit.
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retension
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Rewind the tape, then wind it to the end of the reel, then rewind it again.
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erase
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Erase the tape.
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Options
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-f, --file=device
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Use device as the file name of the tape drive to operate on. To use a tape drive on another machine, use a file name 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).
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--rsh-command=command
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Notifies mt that it should use command to communicate with remote devices instead of /usr/bin/ssh or /usr/bin/rsh.
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-V, --version
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Print the version number of mt.
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Exit Status
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.
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