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DD(1)                                                                    DD(1)



dd -

dd

       [--help]  [--version]  [if=]  [of=]  [ibs=] [obs=] [bs=] [cbs=] [skip=]
       [seek=] [count=] [conv={ascii,  ebcdic,  ibm,  block,  unblock,  lcase,
       ucase, swab, noerror, notrunc, sync}]

dd

         ( ),        , , ,   .

       dd
            , (  512 ).

       bs=
          , sync, noerror,  notrunc, dd
          (   ,   )
          .       ,
        ,   , sync,
            NUL ( , . ).

                , ,
            .
         .

           (  ) : `k'=1024, `b'=512, `w'=2, `c'=1 ( `w'  `c'   GNU; `w'     --
         2  System V  4  4.2BSD).

           `x'  .
        GNU fileutils-4.0 ( bs=, cbs=, ibs=, obs=)  : M=1048576, G=1073741824,
       T, P, E, Z, Y.
        `D'    :  kD=1000,  MD=1000000, GD=1000000000,   .  (,   ls, df, du  M
       . .  ,   dd  ).


       if=
                .

       of=
                .  conv=notrunc, dd

                 ( , seek=).

       ibs=bytes

              bytes
                .   512.

       obs=bytes

              bytes
                .   512.

       bs=bytes

              bytes
                .  ibs

              obs.  ( , bs

              ibs

              obs
                 ,   ,

              sync, noerror

              notrunc,
                 ,
                      ).

       cbs=    block

              unblock.

       skip=blocks

              blocks

              ibs

                   .

       seek=blocks

              blocks

              obs
                 .

       count=blocks

              blocks

              ibs
                 ,     ,  .

       conv=[,]...
               ,   () .  (     ).

               :


              ascii   EBCDIC  ASCII.

              ebcdic  ASCII  EBCDIC.

              ibm     ASCII   EBCDIC.

              block       , cbs ,
                      .

              unblock

                     cbs
                         .

              lcase      .

              ucase      .

              swab        .
                           ,
                       (    ).  [POSIX 1003.2b, PASC interpretations 1003.2 #3
                     #4]

              noerror
                        .

              notrunc
                        .

              sync    ibs
                        .

  GNU
       --help        .

       --version
                       .

       --          .

       LANG,
       LC_ALL, LC_CTYPE  LC_MESSAGES.


       POSIX 1003.2

        ,
       dd
          /    ,
           .  ,  `dd if=myfile of=/dev/mytape conv=sync'.  ,        ,
         ,     .

  `dd if=myfile of=/dev/fd0 bs=1k seek=172'
          , dd
          ,


dd

         fileutils-4.0;
            .
             aeb [AT] cwi.nl.

       fileutils-bugs [AT] gnu.edu.

     <corochoone [AT] perm.ru> 2003
GNU fileutils 4.0                   1998-11                              DD(1)

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