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Plan 9 - man page for dd (plan9 section 1)

DD(1)				     General Commands Manual				    DD(1)

NAME
       dd - convert and copy a file

SYNOPSIS
       dd [ option value ] ...

DESCRIPTION
       Dd copies the specified input file to the specified output with possible conversions.  The
       standard input and output are used by default.  The input and output  block  size  may  be
       specified to take advantage of raw physical I/O.  The options are

       -if f   Open file f for input.

       -of f   Open file f for output.

       -ibs n  Set input block size to n bytes (default 512).

       -obs n  Set output block size (default 512).

       -bs n   Set  both  input and output block size, superseding ibs and obs.  If no conversion
	       is specified, preserve the input block size instead of packing short  blocks  into
	       the  output  buffer.  This is particularly efficient since no in-core copy need be
	       done.

       -cbs n  Set conversion buffer size.

       -skip n Skip n input records before copying.

       -iseek n
	       Seek n records forward on input file before copying.

       -files n
	       Catenate n input files (useful only for magnetic tape or similar input device).

       -oseek n
	       Seek n records from beginning of output file before copying.

       -count n
	       Copy only n input records.

       -conv ascii    Convert EBCDIC to ASCII.

	    ebcdic   Convert ASCII to EBCDIC.

	    ibm      Like ebcdic but with a slightly different character map.

	    block    Convert variable length ASCII records to fixed length.

	    unblock  Convert fixed length ASCII records to variable length.

	    lcase    Map alphabetics to lower case.

	    ucase    Map alphabetics to upper case.

	    swab     Swap every pair of bytes.

	    noerror  Do not stop processing on an error.

	    sync     Pad every input record to ibs bytes.

       Where sizes are specified, a number of bytes is expected.  A number may	end  with  or  to
       specify	multiplication by 1024 or 512 respectively; a pair of numbers may be separated by
       to indicate a product.  Multiple conversions may be specified in the style:

       is used only if or conversion is specified.  In the first  two  cases,  n  characters  are
       copied  into  the  conversion  buffer,  any  specified character mapping is done, trailing
       blanks are trimmed and new-line is added before sending the line to the	output.   In  the
       latter three cases, characters are read into the conversion buffer and blanks are added to
       make up an output record of size n.  If is unspecified or zero, the  and  options  convert
       the  character set without changing the block structure of the input file; the and options
       become a simple file copy.

SOURCE
       /sys/src/cmd/dd.c

SEE ALSO
       cp(1)

DIAGNOSTICS
       Dd reports the number of full + partial input and output blocks handled.

											    DD(1)


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