DC3DD(1) User Commands DC3DD(1) NAME dc3dd - convert and copy a file SYNOPSIS dc3dd [OPERAND]... dc3dd OPTION DESCRIPTION Copy a file, converting and formatting according to the operands. bs=BYTES force ibs=BYTES and obs=BYTES cbs=BYTES convert BYTES bytes at a time conv=CONVS convert the file as per the comma separated symbol list count=SECTORS copy only SECTORS input sectors ibs=BYTES read BYTES bytes at a time (must be a multiple of input sector size) if=FILE read from FILE instead of stdin ifjoin=BASE.FMT read from split files with name BASE and splitformat FMT iflag=FLAGS read as per the comma separated symbol list pattern=HEX write HEX to every byte of the output textpattern=TEXT write the string TEXT repeatedly to the output obs=BYTES write BYTES bytes at a time of=FILE write to FILE instead of stdout of:=COMMAND pipe output to the given command oflag=FLAGS write as per the comma separated symbol list wipe=FILE wipe device FILE with zeros (or specify pattern/textpattern) seek=SECTORS skip SECTORS input sectors at start of output skip=SECTORS skip SECTORS input sectors at start of input status=noxfer suppress transfer statistics split=BYTES split the output into pieces of size BYTES splitformat=FMT create extensions for split pieces using FMT Extensions can be numerical starting at zero, numerical starting at one, or alphabetical. These options are selected by using a series of zeros, ones, or a's, respectively. The number of char- acters used indicates the desired length of the extensions. For example, splitformat=1111 indicates four character numerical extensions starting with 0001. progress=on displays a progress meter progresscount=NUM number of blocks processed between each progress update sizeprobe=on estimates size of input file for use with status hash=ALGORITHM computes ALGORITHM hashes of the input data hashconv=WHEN determines when data should be hashed, either before or after conversions hashwindow=BYTES number of bytes for piecewise hashing hashlog=FILE appends piecewise hashes to the log file errlog=FILE appends errors to the log file log=FILE appends hashes and errors to the same file errors=group group read errors together vf=FILE verify the input against FILE vfjoin=BASE.FMT verify the input against split files with name BASE and split- format FMT verifylog=FILE write the results of the verify to the given file ALGORITHM can be a comma separated list of md5, sha1, sha256, and sha512 BLOCKS and BYTES may be followed by the following multiplicative suf- fixes: xM M, c 1, w 2, b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024, 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 nocreat do not create the output file excl fail if the output file already exists notrunc do not truncate the output file 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; when used with block or unblock, pad with spaces rather than NULs 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 sug- gested) directory fail unless a directory sync likewise, but also for metadata nonblock use non-blocking I/O noctty do not assign controlling terminal from file nofollow do not follow symlinks Sending a INFO signal to a running `dd' process makes it print I/O sta- tistics to standard error and then resume copying. $ dd if=/dev/zero of=/dev/null& pid=$! $ kill -INFO $pid; sleep 1; kill $pid 18335302+0 sectors in 18335302+0 sectors out 9387674624 bytes (9.4 GB) copied, 34.6279 seconds, 271 MB/s Options are: --help display this help and exit --version output version information and exit --flags display compile-time flags AUTHOR Written by Paul Rubin, David MacKenzie, Stuart Kemp, and patched for DC3 by Jesse Kornblum and Andrew Medico. REPORTING BUGS Report bugs to . COPYRIGHT Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO The full documentation for dc3dd is maintained as a Texinfo manual. If the info and dc3dd programs are properly installed at your site, the command info dc3dd should give you access to the complete manual. dc3dd 6.12.3 March 2009 DC3DD(1)