TAP (I)                      3/15/72                      TAP (I)

NAME            tap  --  manipulate DECtape

SYNOPSIS        tap  [ key ] [ name ... ]

DESCRIPTION     tap saves and restores selected portions of the

                file system hierarchy on DECtape.  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.  If files with the same

                      names already exist, they are replaced

                      (hence the "r").  "Same" is determined by

                      string comparison, so "./abc" can never be

                      the same as "/usr/dmr/abc" even if

                      "/usr/dmr" is the current directory.  If no

                      file argument is given, "." is the default.

                   u  updates the tape.  u is the same as r, but

                      a file is replaced only if its modification

                      date is later than the date stored on the

                      tape; that is to say, if it has changed

                      since it was dumped.  u is the default com-

                      mand if none is given.

                   d  deletes the named files and directories

                      from the tape.  At least one file argument

                      must be given.

                   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 tap 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.

                         r  file is being replaced

                         a  file is being added (not there before)

                         x  file is being extracted

                         d  file is being deleted

                      The v option can be used with r, u, d, and

                      x only.

                   c  means a fresh dump is being created; the

                      tape directory will be zeroed before begin-

                      ning.  Usable only with r and u.

                   f  causes new entries copied on tape to be

                      'fake' in that no data is present for these

                      entries.  Such fake entries cannot be ex-

                      tracted.  Usable only with r and u.

                   w  causes tap 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 tap command terminates immediately.  In

                      the x function, files previously asked

                      about have been extracted already.  With r,

                      u, and d no change has been made to the


                   m  make (create) directories during an x if


FILES           /dev/tap?

SEE ALSO        mt(I)

DIAGNOSTICS     Tape open error

                Tape read error

                Tape write error

                Directory checksum

                Directory overflow

                Tape overflow

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

                lected for dumping but before it was dumped)

BUGS            Asks about "fake" entries on "xw", when it should

                ignore them.  If a fake entry is extracted, and

                the file already exists on disk, the extraction

                does not take place (as is correct), but the mode

                and user ID of the file are set to 0.