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Man Pages


Manual Reference Pages  -  GDD (1)

NAME

dd - convert and copy a file

CONTENTS

Synopsis
Description
Author
Copyright

SYNOPSIS

dd [\,OPERAND\/]...
dd \,OPTION\/

DESCRIPTION

Copy a file, converting and formatting according to the operands.
bs=BYTES
  read and write up to BYTES bytes at a time
cbs=BYTES
  convert BYTES bytes at a time
conv=CONVS
  convert the file as per the comma separated symbol list
count=N
  copy only N input blocks
ibs=BYTES
  read up to BYTES bytes at a time (default: 512)
if=FILE
  read from FILE instead of stdin
iflag=FLAGS
  read as per the comma separated symbol list
obs=BYTES
  write BYTES bytes at a time (default: 512)
of=FILE
  write to FILE instead of stdout
oflag=FLAGS
  write as per the comma separated symbol list
seek=N skip N obs-sized blocks at start of output
skip=N skip N ibs-sized blocks at start of input
status=LEVEL
  The LEVEL of information to print to stderr; ’none’ suppresses everything but error messages, ’noxfer’ suppresses the final transfer statistics, ’progress’ shows periodic transfer statistics
N and BYTES may be followed by the following multiplicative suffixes: c =1, w =2, b =512, kB =1000, K =1024, MB =1000*1000, M =1024*1024, xM =M GB =1000*1000*1000, G =1024*1024*1024, and so on for T, P, E, Z, Y.
Each CONV symbol may be:
ascii from EBCDIC to ASCII
ebcdic from ASCII to EBCDIC
ibm from ASCII to alternate 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
sparse try to seek rather than write the output for NUL input blocks
swab swap every pair of input bytes
sync pad every input block with NULs to ibs-size; when used with block or unblock, pad with spaces rather than NULs
excl fail if the output file already exists
nocreat
  do not create the output file
notrunc
  do not truncate the output file
noerror
  continue after read errors
fdatasync
  physically write output file data before finishing
fsync likewise, but also write metadata
Each FLAG symbol may be:
append append mode (makes sense only for output; conv=notrunc suggested)
direct use direct I/O for data
directory
  fail unless a directory
sync likewise, but also for metadata
fullblock
  accumulate full blocks of input (iflag only)
nonblock
  use non-blocking I/O
nocache
  Request to drop cache. See also oflag=sync
noctty do not assign controlling terminal from file
nofollow
  do not follow symlinks
count_bytes
  treat ’count=N’ as a byte count (iflag only)
skip_bytes
  treat ’skip=N’ as a byte count (iflag only)
seek_bytes
  treat ’seek=N’ as a byte count (oflag only)
Sending a INFO signal to a running ’dd’ process makes it print I/O statistics to standard error and then resume copying.
Options are:
--help display this help and exit
--version
  output version information and exit

AUTHOR

Written by Paul Rubin, David MacKenzie, and Stuart Kemp.

REPORTING BUGS

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report dd translation bugs to <http://translationproject.org/team/>

COPYRIGHT

Copyright © 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

Full documentation at: <http://www.gnu.org/software/coreutils/dd>
or available locally via: info \(aq(coreutils) dd invocation\(aq
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GNU coreutils 8.25 DD (1) January 2016

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