Recover Deleted Linux Files With lsof
One of the more neat things you can do with the versatile utility lsof is use it to recover a file you've just accidentally deleted.
To try this out, create a test text file, save it and then type less test.txt. Open another terminal window, and type rm testing.txt. If you try ls testing.txt you'll get an error message. But! less still has a reference to the file. So:
> lsof | grep testing.txt less 4607 juliet 4r REG 254,4 21 8880214 /home/juliet/testing.txt (deleted)
The important columns are the second one, which gives you the PID of the process that has the file open (4607), and the fourth one, which gives you the file descriptor (4). Now, we go look in /proc, where there will still be a reference to the inode, from which you can copy the file back out:
> ls -l /proc/4607/fd/4 lr-x------ 1 juliet juliet 64 Apr 7 03:19 /proc/4607/fd/4 -> /home/juliet/testing.txt (deleted) > cp /proc/4607/fd/4 testing.txt.bk
Note: don't use the -a flag with cp, as this will copy the (broken) symbolic link, rather than the actual file contents.
Now check the file to make sure you've got what you think you have, and you're done!
Article courtesy of ServerWatch
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