dd man page on Plan9

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DD(1)									 DD(1)

       dd - convert and copy a file

       dd [ option value ] ...

       Dd  copies the specified input file to the specified output with possi‐
       ble 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 blocks before copying.
       -iseek n
	      Seek n blocks forward on input file before copying.
       -iseekb n
	      Seek n bytes 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 blocks from beginning of output file before copying.
       -oseekb n
	      Seek n bytes from beginning of output file before copying.
       -count n
	      Copy only n input blocks.
       -trunc n
	      If n is 0, open the output file without truncating it.
       -quiet n
	      If n is 1, omit the summary of blocks transferred.
       -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  (lines)  to	 fixed
		     length blocks.
	    unblock  Convert  fixed  length  ASCII  blocks  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 block 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 charac‐
       ter  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 block 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.



       Dd reports the number of full + partial input and  output  blocks  han‐

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