dd(1)

     NAME
          dd - convert a file while copying it

     SYNOPSIS
          dd [--help] [--version] [if=file] [of=file] [ibs=bytes]
          [obs=bytes] [bs=bytes] [cbs=bytes] [skip=blocks]
          [seek=blocks] [count=blocks]
          [conv={ascii,ebcdic,ibm,block,unblock,lcase,ucase,swab,noerror,notrunc,
          sync}]

     DESCRIPTION
          This documentation is no longer being maintained and may be
          inaccurate or incomplete.  The Texinfo documentation is now
          the authoritative source.

          This manual page documents the GNU version of dd.  dd copies
          a file (from the standard input to the standard output, by
          default) with a user-selectable blocksize, while optionally
          performing conversions on it.

        OPTIONS
          Numbers can be followed by a multiplier:
          b=512, c=1, k=1024, w=2, xm=number m

          --help
               Print a usage message on standard output and exit
               successfully.

          --version
               Print version information on standard output then exit
               successfully.

          if=file
               Read from file instead of the standard input.

          of=file
               Write to file instead of the standard output.  Unless
               conv=notrunc is given, truncate file to the size
               specified by seek= (0 bytes if seek= is not given).

          ibs=bytes
               Read bytes bytes at a time.

          obs=bytes
               Write bytes bytes at a time.

          bs=bytes
               Read and write bytes bytes at atime.  Override ibs and
               obs.

          cbs=bytes
               Convert bytes bytes at a time.
          skip=blocks
               Skip blocks ibs-sized blocks at start of input.

          seek=blocks
               Skip blocks obs-sized blocks at start of output.

          count=blocks
               Copy only blocks ibs-sized input blocks.

          conv=conversion[,conversion...]
               Convert the file as specified by the conversion
               arguments.
               Conversions:

               ascii
                    Convert EBCDIC to ASCII.

               ebcdic
                    Convert ASCII to EBCDIC.

               ibm  Convert ASCII to alternate EBCDIC.

               block
                    Pad newline-terminated records to size of cbs,
                    replacing newline with trailing spaces.

               unblock
                    Replace trailing spaces in cbs-sized block with
                    newline.

               lcase
                    Change uppercase characters to lowercase.

               ucase
                    Change lowercase characters to uppercase.

               swab Swap every pair of input bytes.  Unlike the Unix
                    dd, this works when an odd number of bytes are
                    read.  If the input file contains an odd number of
                    bytes, the last byte is simply copied (since there
                    is nothing to swap it with).

               noerror
                    Continue after read errors.

               notrunc
                    Do not truncate the output file.

               sync Pad every input block to size of ibs with trailing
                    NULs.