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ddrescue包装说明

像DD，dd_rescue从一个文件或块设备到另一台做复制数据。您可以指定文件的位置（称为寻求并跳过DD）。有几种不同：

dd_rescue不提供的字符转换。
该命令的语法是不同的。呼叫dd_rescue -h。
dd_rescue不上的错误中止输入文件，除非你指定一个最大的错误号。然后，当达到这个数字dd_rescue将中止。
dd_rescue不会截断输出文件，除非要求。
你可以告诉dd_rescue从文件的末尾开始和向后移动。
它使用两个块大小，大的（软），块大小和小（硬）的块大小。在错误的情况下，规模回落到了小的，没有错误的一段时间后，再次提升。资料来源：http://www.garloff.de/kurt/linux/ddrescue/

ddrescue首页 | 卡利ddrescue回购

作者：garloff

许可：GPL第二版

0x01 包含在ddrescue软件包工具

dd_rescue - 从一个文件或块设备复制到另一个数据

:~# dd_rescue -h
dd_rescue Version 1.28, 
, 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.

0x02 dd_rescue用法示例

开始在输入文件的位置 100（-s 100的/ var / log / messages中）和写 ，开始在目标文件 （-S 0的/ tmp / ddrescue出） 的位置0：

:~# dd_rescue -s 100 /var/log/messages -S 0 /tmp/ddrescue-out
dd_rescue: (info): Using softbs=65536, hardbs=4096
dd_rescue: (info) expect to copy 1766kB from /var/log/messages
dd_rescue: (info): ipos:      1024.1k, opos:      1024.0k, xferd:      1024.0k
                 errs:      0, errxfer:         0.0k, succxfer:      1024.0k
           +curr.rate:  1122807kB/s, avg.rate:  1018906kB/s, avg.load:  0.0%
           >.......................-.................<  57%  ETA:  0:00:00 
dd_rescue: (info): read /var/log/messages (1767.0k): EOF
dd_rescue: (info): Summary for /var/log/messages -> /tmp/ddrescue-out:
dd_rescue: (info): ipos:      1767.0k, opos:      1767.0k, xferd:      1767.0k
                 errs:      0, errxfer:         0.0k, succxfer:      1767.0k
           +curr.rate:   352945kB/s, avg.rate:   568151kB/s, avg.load:  0.0%
           >.......................-................-< 100%  ETA:  0:00:00

原文来自:https://www.hackfun.org/kali-tools/ddrescue_zh.html。转载请注明原出处，商用请联系原作者授权。

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