MT (I)                       6/12/72                       MT (I)

NAME            mt  --  manipulate magtape

SYNOPSIS        mt  [ key ] [ name ... ]

DESCRIPTION     mt saves and restores selected portions of the

                file system hierarchy on magtape.  Its actions

                are controlled by the key argument.  The key is a

                string of characters containing at most one func-

                tion letter and possibly one or more function

                modifiers.  Other arguments to the command are

                file or directory names specifying which files

                are to be dumped, restored, or tabled.

                The function portion of the key is specified by

                one of the following letters:

                   r  The indicated files and directories, to-

                      gether with all subdirectories, are dumped

                      onto the tape.  The old contents of the

                      tape are lost.

                   x  extracts the named files from the tape to

                      the file system.  The owner, mode, and

                      date-modified are restored to what they

                      were when the file was dumped.  If no file

                      argument is given, the entire contents of

                      the tape are extracted.

                   t  lists the names of all files stored on the

                      tape which are the same as or are hierar-

                      chically below the file arguments.  If no

                      file argument is given, the entire contents

                      of the tape are tabled.

                   l  is the same as t except that an expanded

                      listing is produced giving all the avail-

                      able information about the listed files.

                The following characters may be used in addition

                to the letter which selects the function desired.

                   0, ..., 7  This modifier selects the drive on

                      which the tape is mounted.  "0" is the de-


                   v  Normally mt does its work silently.  The v

                      (verbose) option causes it to type the name

                      of each file it treats preceded by a letter

                      to indicate what is happening.

                         a  file is being added

                         x  file is being extracted

                      The v option can be used with r and x only.

                   f  causes new entries copied on tape to be

                      'fake' in that only the entries, not the

                      data associated with the entries are up-

                      dated.  Such fake entries cannot be ex-

                      tracted.  Usable only with r.

                   w  causes mt to pause before treating each

                      file, type the indicative letter and the

                      file name (as with v) and await the user's

                      response.  Response "y" means "yes", so the

                      file is treated.  Null response means "no",

                      and the file does not take part in whatever

                      is being done.  Response "x" means "exit";

                      the mt command terminates immediately.  In

                      the x function, files previously asked

                      about have been extracted already.  With r,

                      no change has been made to the tape.

                   m  make (create) directories during an x if


FILES           /dev/mt?

SEE ALSO        tap(I), tap(V)

DIAGNOSTICS     Tape open error

                Tape read error

                Tape write error

                Directory checksum

                Directory overflow

                Seek error

                Tape overflow

                Phase error (a file has changed after it was se-

                lected for dumping but before it was dumped)

BUGS            If, during an "x", the files are specified in a

                different order than they are on the tape, seek

                errors will result because the tape cannot be re-