NAME

       dd - Copy, and optionally convert, a file system resource

SYNOPSIS

       dd [-h|--help] [-V|--version] [operands]

DESCRIPTION

       Copy, and optionally convert, a file system resource

OPTIONS

       -h, --help
              Print help

       -V, --version
              Print version

       [operands]

EXTRA

       ### Operands

       - bs=BYTES : read and write up to BYTES bytes at a time (default: 512);
          overwrites ibs and obs.  - cbs=BYTES : the 'conversion block size' in bytes. Applies to the
          conv=block,  and conv=unblock operations.  - conv=CONVS : a comma-separated list of conversion options
       or (for legacy
          reasons) file flags.  - count=N : stop reading input after N ibs-sized read operations rather
          than proceeding until EOF. See iflag=count_bytes if stopping after N bytes
          is preferred - ibs=N : the size of buffer used for reads (default: 512) - if=FILE : the file used  for
       input.  When  not  specified, stdin is used instead - iflag=FLAGS : a comma-separated list of input flags
       which specify how the
          input source is treated. FLAGS may be any of the input-flags or general-flags
          specified below.  - skip=N (or iseek=N) : skip N ibs-sized records into input before beginning
          copy/convert operations. See iflag=seek_bytes if seeking N bytes is preferred.  - obs=N : the size  of
       buffer used for writes (default: 512) - of=FILE : the file used for output. When not specified, stdout is
       used
          instead - oflag=FLAGS : comma separated list of output flags which specify how the
          output source is treated. FLAGS may be any of the output flags or general
          flags specified below - seek=N (or oseek=N) : seeks N obs-sized records into output before
          beginning copy/convert operations. See oflag=seek_bytes if seeking N bytes is
          preferred - status=LEVEL : controls whether volume and performance stats are written to
          stderr.

         When unspecified, dd will print stats upon completion. An example is below.

         plain
           6+0 records in
           16+0 records out
           8192 bytes (8.2 kB, 8.0 KiB) copied, 0.00057009 s,
           14.4 MB/s

         The first two lines are the 'volume' stats and the final line is the
         'performance' stats.
         The volume stats indicate the number of complete and partial ibs-sized reads,
         or obs-sized writes that took place during the copy. The format of the volume
         stats is <complete>+<partial>. If records have been truncated (see
         conv=block), the volume stats will contain the number of truncated records.

         Possible LEVEL values are:
         - progress : Print periodic performance stats as the copy proceeds.
         - noxfer : Print final volume stats, but not performance stats.
         - none : Do not print any stats.

         Printing performance stats is also triggered by the INFO signal (where supported),
         or the USR1 signal. Setting the POSIXLY_CORRECT environment variable to any value
         (including an empty value) will cause the USR1 signal to be ignored.

       ### Conversion Options

       - ascii : convert from EBCDIC to ASCII. This is the inverse of the ebcdic
         option.  Implies  conv=unblock.   -  ebcdic  : convert from ASCII to EBCDIC. This is the inverse of the
       ascii
         option. Implies conv=block.  - ibm : convert from ASCII to EBCDIC, applying the conventions for [, ]
         and ~ specified in POSIX. Implies conv=block.

       - ucase : convert from lower-case to upper-case.  - lcase : converts from upper-case to lower-case.

       - block : for each newline less than the size indicated by cbs=BYTES, remove
         the newline and pad with spaces up to cbs. Lines longer than cbs are truncated.  - unblock :  for  each
       block of input of the size indicated by cbs=BYTES, remove
         right-trailing spaces and replace with a newline character.

       - sparse : attempts to seek the output when an obs-sized block consists of
         only zeros.  - swab : swaps each adjacent pair of bytes. If an odd number of bytes is
         present,  the final byte is omitted.  - sync : pad each ibs-sided block with zeros. If block or unblock
       is
         specified, pad with spaces instead.  - excl : the output file must be created. Fail if the output  file
       is already
         present.  - nocreat : the output file will not be created. Fail if the output file in
         not already present.  - notrunc : the output file will not be truncated. If this option is not
         present,  output  will  be truncated when opened.  - noerror : all read errors will be ignored. If this
       option is not present,
         dd will only ignore Error::Interrupted.  - fdatasync : data will be written before finishing.  -  fsync
       : data and metadata will be written before finishing.

       ### Input flags

       -  count_bytes  : a value to count=N will be interpreted as bytes.  - skip_bytes : a value to skip=N will
       be interpreted as bytes.  - fullblock : wait for ibs bytes from each read. zero-length reads are still
         considered EOF.

       ### Output flags

       - append : open file in append mode. Consider setting conv=notrunc as well.  - seek_bytes :  a  value  to
       seek=N will be interpreted as bytes.

       ### General Flags

       - direct : use direct I/O for data.  - directory : fail unless the given input (if used as an iflag) or
         output  (if  used  as an oflag) is a directory.  - dsync : use synchronized I/O for data.  - sync : use
       synchronized I/O for data and metadata.  - nonblock : use non-blocking I/O.  - noatime :  do  not  update
       access  time.   -  nocache  : request that OS drop cache.  - noctty : do not assign a controlling tty.  -
       nofollow : do not follow system links.

VERSION

       v0.0.24

                                                    dd 0.0.24                                              dd(1)