ddhelp

Usage: dd [OPTION]...
Copy a file, converting and formatting according to the options.

  bs=BYTES        force ibs=BYTES and obs=BYTES
  cbs=BYTES       convert BYTES bytes at a time
  conv=KEYWORDS   convert the file as per the comma separated keyword list
  count=BLOCKS    copy only BLOCKS input blocks
  ibs=BYTES       read BYTES bytes at a time
  if=FILE         read from FILE instead of stdin
  obs=BYTES       write BYTES bytes at a time
  of=FILE         write to FILE instead of stdout, don't truncate file
  seek=BLOCKS     skip BLOCKS obs-sized blocks at start of output
  skip=BLOCKS     skip BLOCKS ibs-sized blocks at start of input
      --help      display this help and exit
      --version   output version information and exit

BYTES may be suffixed: by xM for multiplication by M, by c for x1,
by w for x2, by b for x512, by k for x1024.  Each KEYWORD may be:

  ascii     from EBCDIC to ASCII
  ebcdic    from ASCII to EBCDIC
  ibm       from ASCII to alternated EBCDIC
  block     pad newline-terminated records with spaces to cbs-size
  unblock   replace trailing spaces in cbs-size records with newline
  lcase     change upper case to lower case
  ucase     change lower case to upper case
  swab      swap every pair of input bytes
  noerror   continue after read errors
  sync      pad every input block with NULs to ibs-size

Report bugs to fileutils-bugs@gnu.ai.mit.edu