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copy byte blocks from one file into another file, with a specified offset and length using the free sfk partcopy command for windows and linux.

- download the free swiss file knife base from sourceforge.
- unpack the tool using winzip or unzip.
- open the Windows Command Line or a Linux shell.

sfk partcopy infile offset length outfile [offset2] [-yes]
sfk partcopy infile -fromto startoffset endoffset outfile ...

   reads length bytes from infile at specified offset,
   writing them into another file. if offset2 is specified,
   outfile is not created, but the bytes are used to overwrite
   other bytes within the output file.

   by default, the command simulates, checking file lengths
   but not copying any data. add -yes to really copy contents.

   length syntax:
       100000   ,  100k        = 100000 bytes
       2000000k , 2000m , 2g   = 2 giga-bytes

   options
      -quiet    do not print number of copied bytes.
      -fromto   use this if you don't want to specify offset
                and length for the input, but a start and end
                offset (with length being end minus start).

   see also
      sfk hexdump   -offlen offset len infile
      sfk hexfind   infile -bin /hexvalues/
      sfk hextobin

   examples
      sfk partcopy first.dat 10000 50 second.dat 500000
         copies 50 bytes from first.dat at offset 10000 into
         second.dat (which should exist) at offset 500000

      sfk partcopy first.dat -fromto 0x2710 0x2950 second.dat
         input start and end offset in hexadecimal numbers,
         output file is created (no output offset given).
 

read more about all sfk functions here.

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