rmt - remote magnetic tape server

       Report bugs to <bug-tar@gnu.org>.

       Using this utility as a general-purpose remote file access tool is discouraged.

Odevice\nflags\n
              Opens the device with given flags. If a device had  already  been  opened,  it  is  closed  before
              opening the new one.

              Argumentsdevice The name of the device to open.

              flags  Flags for open(2): a decimal number, or any valid O_* constant from fcntl.h (the initial O_
                     may be omitted), or a bitwise or (using |) of any number of these, e.g.:
                         576
                         64|512
                         CREAT|TRUNC
                     In  addition, a combined form is also allowed, i.e. a decimal mode followed by its symbolic
                     representation.  In this case the symbolic representation is given preference.

              ReplyA0\n on success.

              Extensions
                     BSD version allows only decimal number as flags.

       C[device]\n
              Close the currently open device.

              Arguments
                     Any arguments are silently ignored.

              ReplyA0\n on success.

       Lwhence\noffset\n
              Performs an lseek(2) on the currently open device with the specified parameters.

              Argumentswhence Where to measure offset from. Valid values are:

                             0, SET, SEEK_SET   seek from the file beginning
                             1, CUR, SEEK_CUR   seek from the current location
                             2, END, SEEK_END   seek from the file end

              ReplyAoffset\n on success. The offset is the new offset in file.

              Extensions
                     BSD version allows only 0,1,2 as whence.

       Rcount\n
              Read count bytes of data from the current device.

              Argumentscount  number of bytes to read.

              Reply
                     On success:

                         Ardcount\n

                     followed by rdcount bytes of data read from the device.

       Wcount\n
              Writes data onto the current device.  The command is followed by count bytes of input data.

              Argumentscount  Number of bytes to write.

              Reply
                     On success: Awrcount\n, where wrcount is the number of bytes actually written.

       Iopcode\ncount\n
              Perform a MTIOCOPioctl(2) command with the specified paramedters.

              ArgumentsopcodeMTIOCOP operation code.

                     count  mt_count.

              Reply
                     On success: A0\n.

       S\n    Returns the status of the currently open device, as obtained from a MTIOCGETioctl(2) call.

              Arguments
                     None

              Reply
                     On success: Acount\n followed by count bytes of data.

       Copyright © 2013, 2018 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.

RMT                                              March 24, 2018                                           RMT(8)

Rmt provides remote access to files and devices for tar(1), cpio(1), and similar backup utilities.  It is
       normally  called  by  running  rsh(1) or ssh(1) to the remote machine, optionally using a different login
       name if one is supplied.

       The calling program communicates with rmt by sending requests on its standard input and  reading  replies
       from  the  standard output.  A request consists of a request letter followed by an argument (if required)
       and a newline character.  Additional data, if any, are sent after the newline.  On success, rmt returns

           Anumber\n

       where number is an ASCII representation of a decimal return code.  Additional  data  are  returned  after
       this line.  On error, the following response is returned:

           Eerrno\nerror-message\n

       where  errno  is one of the system error codes, as described in errno(3), and error-message is a one-line
       human-readable description of the error, as printed by perror(3).

       Available commands and possible responses are discussed in detail in the subsequent section.

       The rmt command appeared in 4.2BSD.  The GNU rmt is written from scratch, using the BSD specification.

       rmt - remote magnetic tape server

tar(1).

rmt