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Copy a file, converting and formatting according to the operands.
read and write BYTES bytes at a time (also see ibs=,obs=)
convert BYTES bytes at a time
convert the file as per the comma separated symbol list
copy only N input blocks
read BYTES bytes at a time (default: 512)
read from FILE instead of stdin
read as per the comma separated symbol list
write BYTES bytes at a time (default: 512)
write to FILE instead of stdout
write as per the comma separated symbol list
skip BLOCKS obs-sized blocks at start of output
skip BLOCKS ibs-sized blocks at start of input
WHICH info to suppress outputting to stderr; 'noxfer' suppresses
transfer stats, 'none' suppresses all
BLOCKS and BYTES may be followed by the following multiplicative suf-
fixes: 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.
do not create the output file
excl fail if the output file already exists
do not truncate the output file
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
continue after read errors
sync pad every input block with NULs to ibs-size; when used with
block or unblock, pad with spaces rather than NULs
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 sug-
direct use direct I/O for data
fail unless a directory
dsync use synchronized I/O for data
sync likewise, but also for metadata
accumulate full blocks of input (iflag only)
use non-blocking I/O
do not update access time
noctty do not assign controlling terminal from file
--help display this help and exit
output version information and exit
Written by Paul Rubin, David MacKenzie, and Stuart Kemp.
Report dd bugs to email@example.com
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report dd translation bugs to <http://translationproject.org/team/>
Copyright (C) 2010 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.
The full documentation for dd is maintained as a Texinfo manual. If
the info and dd programs are properly installed at your site, the com-
info coreutils 'dd invocation'
should give you access to the complete manual.
GNU coreutils 8.4 November 2015 DD(1)