|  | 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 nSeek n records forward on input file before copying.
 −files nCatenate n input files (useful only for magnetic tape
    or similar input device).
 −oseek nSeek n records from beginning of output file before copying.
 −count nCopy only n input records.
 −trunc nBy default, dd truncates the output file when it opens
    it; −trunc 0 opens it without truncation.
 −quiet nBy default, dd prints the number of blocks read and written
    once it is finished. −quiet 1 silences this summary.
 −conv ascii    Convert EBCDIC to ASCII.
 
 Where sizes are specified, a number of bytes is expected. A number
    may end with k or b to specify multiplication by 1024 or 512 respectively;
    a pair of numbers may be separated by x to indicate a product.
    Multiple conversions may be specified in the style: −conv ebcdic,ucase.
    
    
    
    Cbs is used only if ascii, unblock, ebcdic, ibm, or block 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 cbs is unspecified or zero, the ascii, ebcdic, and
    ibm options convert the character set without changing the block
    structure of the input file; the unblock and block options become
    a simple file copy.|  |  |  | 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.
 
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