deblock(1)                     DG/UX R4.11MU05                    deblock(1)


NAME
       deblock - change blocking size

SYNOPSIS
       deblock [-i] [-o] [-p] [-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:

       -isize    Input buffer (record) size in bytes.  The default is 5120.

       -osize    Output buffer (record) size in bytes.  The default is 1024.

       -psize    Pad size in bytes.  The last output record will be padded
                 with nulls if necessary to make its size a multiple of this
                 value.  The default is 1 (no null padding).

       -fsize    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 intermediate 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 -p512 -f1024

SEE ALSO
       dd(1).


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