deblock(1)                 DG/UX 4.30                  deblock(1)



     NAME
          deblock - change blocking size

     SYNOPSIS
          deblock [-i] [-o] [-f]

     DESCRIPTION
          Deblock reads from standard input and writes to standard
          output.  This utility is used to change the blocking factor
          between input and output.  An intermediate buffer stores
          bits of information to be sent to output.   The user selects
          the size of this buffer.  If this buffer is sufficiently
          large, limited streaming is possible on streamer tapes.

          The available options for deblock are as follows:

          -i<size>  Input buffer (record) size in bytes.  The default
                    is 5120.

          -o<size>  Output buffer (record) size in bytes.  The default
                    is 1024.

          -f<size>  The factor used to determine the intermediate
                    buffer size.  The intermediate buffer size is
                    determined by multiplying the size of the input
                    buffer by the value of -f and then adding the size
                    of the output buffer.

          To facilitate streaming of tapes, reads with buffer size
          specified by the "i" option are performed until the
          intermeditate buffer is filled.  When the intermediate
          buffer fills, writes with buffer size specified by the "o"
          option are performed until the intermediate buffer is empty.
          The "f" option sets the intermediate buffer size.

     EXAMPLE
          The following command sequence reads a file, compresses it,
          and writes it to a tape in cpio format.  If the tape is a
          streaming tape, it will stream during the time that the
          intermediate buffer is being output.  The output buffer size
          is selected for streaming of B media.  The intermediate
          buffer size is 540,672 (512 * 1024+16384).

               echo foo|cpio -ob|compress|deblock -i512 -o16384 -f1024

     SEE ALSO
          dd(1)








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