Recover a deleted file

grep -a -B 25 -A 100 'some string in the file' /dev/sda1 > results.txt
grep searches through a file and prints out all the lines that match some pattern. Here, the pattern is some string that is known to be in the deleted file. The more specific this string can be, the better. The file being searched by grep (/dev/sda1) is the partition of the hard drive the deleted file used to reside in. The ?-a? flag tells grep to treat the hard drive partition, which is actually a binary file, as text. Since recovering the entire file would be nice instead of just the lines that are already known, context control is used. The flags ?-B 25 -A 100? tell grep to print out 25 lines before a match and 100 lines after a match. Be conservative with estimates on these numbers to ensure the entire file is included (when in doubt, guess bigger numbers). Excess data is easy to trim out of results, but if you find yourself with a truncated or incomplete file, you need to do this all over again. Finally, the ?> results.txt? instructs the computer to store the output of grep in a file called results.txt. Source: http://spin.atomicobject.com/2010/08/18/undelete?utm_source=y-combinator&utm_medium=social-media&utm_campaign=technical

24
By: olalonde
2010-08-19 20:07:42

What Others Think

Nice trick, but using PhotoRec is probably easier.
Tungmar · 624 weeks and 4 days ago
I've used that technique before. See the script referenced at the bottom of http://www.pixelbeat.org/docs/disk_grep.html
pixelbeat · 624 weeks and 2 days ago
If results.txt is located in /dev/sda1, isn't there a risk of infinite matching loop ? Like in a grep xyz . > ./result.txt for example
jim · 581 weeks and 5 days ago
@jim: writes to the affected file system should be strictly avoided during the recovery operation, so results.txt shouldn't be created on /dev/sda1 anyway.
lordtoran · 559 weeks and 6 days ago
You can learn so many such unix commands from here and it's good to see the details regarding the cbdbalmsalves.com commands that are used to recover a deleted file. I am looking here for more details regarding such commands and keep sharing more details here.
Alyssalauren · 27 weeks and 4 days ago
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seofox · 26 weeks and 4 days ago
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steelfiber · 24 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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