DD(1)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 User Commands\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DD(1)<\/p>\n
NAME<\/p>\n
dd – convert and copy a file<\/p>\n
SYNOPSIS<\/p>\n
dd [OPERAND]…
\ndd OPTION<\/p>\n
DESCRIPTION<\/p>\n
Copy a file, converting and formatting according to the operands.<\/p>\n
bs=BYTES
\nread and write up to BYTES bytes at a time<\/p>\n
cbs=BYTES
\nconvert BYTES bytes at a time<\/p>\n
conv=CONVS
\nconvert the file as per the comma separated symbol list<\/p>\n
count=N
\ncopy only N input blocks<\/p>\n
ibs=BYTES
\nread up to BYTES bytes at a time (default: 512)<\/p>\n
if=FILE
\nread from FILE instead of stdin<\/p>\n
iflag=FLAGS
\nread as per the comma separated symbol list<\/p>\n
obs=BYTES
\nwrite BYTES bytes at a time (default: 512)<\/p>\n
of=FILE
\nwrite to FILE instead of stdout<\/p>\n
oflag=FLAGS
\nwrite as per the comma separated symbol list<\/p>\n
seek=N skip N obs-sized blocks at start of output<\/p>\n
skip=N skip N ibs-sized blocks at start of input<\/p>\n
status=WHICH
\nWHICH info to suppress outputting to stderr; ‘noxfer’
\nsuppresses transfer stats, ‘none’ suppresses all<\/p>\n
N and BYTES may be followed by the following multiplicative suffixes:
\nc =1, w =2, b =512, kB =1000, K =1024, MB =1000*1000, M =1024*1024,
\nxM =M GB =1000*1000*1000, G =1024*1024*1024, and so on for T, P, E,
\nZ, Y.<\/p>\n
Each CONV symbol may be:<\/p>\n
ascii\u00a0 from EBCDIC to ASCII<\/p>\n
ebcdic from ASCII to EBCDIC<\/p>\n
ibm\u00a0\u00a0\u00a0 from ASCII to alternate EBCDIC<\/p>\n
block\u00a0 pad newline-terminated records with spaces to cbs-size<\/p>\n
unblock
\nreplace trailing spaces in cbs-size records with newline<\/p>\n
lcase\u00a0 change upper case to lower case<\/p>\n
ucase\u00a0 change lower case to upper case<\/p>\n
sparse try to seek rather than write the output for NUL input blocks<\/p>\n
swab\u00a0\u00a0 swap every pair of input bytes<\/p>\n
sync\u00a0\u00a0 pad every input block with NULs to ibs-size; when used with
\nblock or unblock, pad with spaces rather than NULs<\/p>\n
excl\u00a0\u00a0 fail if the output file already exists<\/p>\n
nocreat
\ndo not create the output file<\/p>\n
notrunc
\ndo not truncate the output file<\/p>\n
noerror
\ncontinue after read errors<\/p>\n
fdatasync
\nphysically write output file data before finishing<\/p>\n
fsync\u00a0 likewise, but also write metadata<\/p>\n
Each FLAG symbol may be:<\/p>\n
append append mode (makes sense only for output; conv=notrunc
\nsuggested)<\/p>\n
direct use direct I\/O for data<\/p>\n
directory
\nfail unless a directory<\/p>\n
dsync\u00a0 use synchronized I\/O for data<\/p>\n
sync\u00a0\u00a0 likewise, but also for metadata<\/p>\n
fullblock
\naccumulate full blocks of input (iflag only)<\/p>\n
nonblock
\nuse non-blocking I\/O<\/p>\n
noatime
\ndo not update access time<\/p>\n
nocache
\ndiscard cached data<\/p>\n
noctty do not assign controlling terminal from file<\/p>\n
nofollow
\ndo not follow symlinks<\/p>\n
count_bytes
\ntreat ‘count=N’ as a byte count (iflag only)<\/p>\n
skip_bytes
\ntreat ‘skip=N’ as a byte count (iflag only)<\/p>\n
seek_bytes
\ntreat ‘seek=N’ as a byte count (oflag only)<\/p>\n
Sending a USR1 signal to a running ‘dd’ process makes it print I\/O
\nstatistics to standard error and then resume copying.<\/p>\n
$ dd if=\/dev\/zero of=\/dev\/null& pid=$!
\n$ kill -USR1 $pid; sleep 1; kill $pid<\/p>\n
18335302+0 records in 18335302+0 records out 9387674624 bytes
\n(9.4 GB) copied, 34.6279 seconds, 271 MB\/s<\/p>\n
Options are:<\/p>\n
–help display this help and exit<\/p>\n
–version
\noutput version information and exit<\/p>\n
GNU coreutils online help: <http:\/\/www.gnu.org\/software\/coreutils\/>
\nReport dd translation bugs to <http:\/\/translationproject.org\/team\/><\/p>\n
AUTHOR<\/p>\n
Written by Paul Rubin, David MacKenzie, and Stuart Kemp.<\/p>\n
COPYRIGHT<\/p>\n
Copyright \u00a9 2014 Free Software Foundation, Inc.\u00a0 License GPLv3+: GNU
\nGPL version 3 or later <http:\/\/gnu.org\/licenses\/gpl.html>.
\nThis is free software: you are free to change and redistribute it.
\nThere is NO WARRANTY, to the extent permitted by law.<\/p>\n
SEE ALSO<\/p>\n
The full documentation for dd is maintained as a Texinfo manual.\u00a0 If
\nthe info and dd programs are properly installed at your site, the
\ncommand<\/p>\n
info coreutils ‘dd invocation’<\/p>\n
should give you access to the complete manual.<\/p>\n
COLOPHON<\/p>\n
This page is part of the coreutils (basic file, shell and text
\nmanipulation utilities) project.\u00a0 Information about the project can
\nbe found at \u27e8http:\/\/www.gnu.org\/software\/coreutils\/\u27e9.\u00a0 If you have a
\nbug report for this manual page, see
\n\u27e8http:\/\/www.gnu.org\/software\/coreutils\/\u27e9.\u00a0 This page was obtained from
\nthe tarball coreutils-8.23.tar.xz fetched from
\n\u27e8http:\/\/www.gnutls.org\/download.html\u27e9 on 2014-12-30.\u00a0 If you discover
\nany rendering problems in this HTML version of the page, or you
\nbelieve there is a better or more up-to-date source for the page, or
\nyou have corrections or improvements to the information in this
\nCOLOPHON (which is not part of the original manual page), send a mail
\nto\u00a0man-pages@man7.org<\/p>\n
GNU coreutils 8.23\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 December 2014\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DD(1)<\/p>\n","protected":false},"excerpt":{"rendered":"
DD(1)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 User Commands\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DD(1) NAME dd – convert and copy a file 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 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[8],"tags":[],"class_list":["post-308","post","type-post","status-publish","format-standard","hentry","category-shell"],"_links":{"self":[{"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=\/wp\/v2\/posts\/308","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=308"}],"version-history":[{"count":0,"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=\/wp\/v2\/posts\/308\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=308"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linuxboxen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}