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2.0 KiB
2.0 KiB
ddrescue
Notes
dd_rescue copies data from one file (or block device) to another.
Help Text
dd_rescue Version 1.28, garloff@suse.de, GNU GPL
($Id: dd_rescue.c,v 1.130 2012/05/19 20:46:14 garloff Exp $)
(compiled Dec 15 2012 12:04:22 by gcc (Debian 4.7.2-4) 4.7.2)
(features: O_DIRECT splice )
dd_rescue copies data from one file (or block device) to another.
USAGE: dd_rescue [options] infile outfile
Options: -s ipos start position in input file (default=0),
-S opos start position in output file (def=ipos),
-b softbs block size for copy operation (def=65536, 1048576 for -d),
-B hardbs fallback block size in case of errs (def=4096, 512 for -d),
-e maxerr exit after maxerr errors (def=0=infinite),
-m maxxfer maximum amount of data to be transfered (def=0=inf),
-y syncfrq frequency of fsync calls on outfile (def=512*softbs),
-l logfile name of a file to log errors and summary to (def=""),
-o bbfile name of a file to log bad blocks numbers (def=""),
-r reverse direction copy (def=forward),
-t truncate output file (def=no),
-d/D use O_DIRECT for input/output (def=no),
-k use efficient in-kernel zerocopy splice
-w abort on Write errors (def=no),
-a spArse file writing (def=no),
-A Always write blocks, zeroed if err (def=no),
-i interactive: ask before overwriting data (def=no),
-f force: skip some sanity checks (def=no),
-p preserve: preserve ownership / perms (def=no),
-q quiet operation,
-v verbose operation,
-V display version and exit,
-h display this help and exit.
Sizes may be given in units b(=512), k(=1024), M(=1024^2) or G(1024^3) bytes
This program is useful to rescue data in case of I/O errors, because
it does not necessarily abort or truncate the output.