http://qyiyunso.blog.163.com/blog/static/350776862010826115537113/
今天一时手快 rm -rf .* ，删除了一个重要邮件目录，幸好通过extundelete恢复了。
记下操作流程：
1.准备工作
主要通过 extundelete
0.2.0完成恢复
需要依赖两个包
sudo aptitude install e2fsprogs e2fslibs-dev
下载页面http://extundelete.sourceforge.net/
快速下载： download extundelete
编译三部曲
./configure
make
sudo make install
2.如果分区已经挂载，先umount，并且在将要恢复的地方查看空间大小
df -h ./
如果你要恢复的是根目录或者系统目录就只有拿硬盘挂到另外一台电脑上操作了。
3.恢复制定分区下所有删除文件，默认恢复到执行命令的目录下，文件夹名字为RECOVERED_FILES，使用详情请参考：extundelete --help 运行的结果
sudo extundelete /dev/sda8 –restore-all
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$ extundelete --help
Usage: extundelete [options] [--] device-file
Options:
--version, -[vV] Print version and exit successfully.
--help, Print this help and exit successfully.
--superblock Print contents of superblock in addition to the rest.
If no action is specified then this option is implied.
--journal Show content of journal.
--after dtime Only process entries deleted on or after 'dtime'.
--before dtime Only process entries deleted before 'dtime'.
Actions:
--inode ino Show info on inode 'ino'.
--block blk Show info on block 'blk'.
--restore-inode ino[,ino,...]
Restore the file(s) with known inode number 'ino'.
The restored files are created in ./RESTORED_FILES
with their inode number as extension (ie, file.12345).
--restore-file 'path' Will restore file 'path'. 'path' is relative to root
of the partition and does not start with a '/' (it
must be one of the paths returned by --dump-names).
The restored file is created in the current
directory as 'RECOVERED_FILES/path'.
--restore-files 'path' Will restore files which are listed in the file 'path'.
Each filename should be in the same format as an option
to --restore-file, and there should be one per line.
--restore-all Attempts to restore everything.
-j journal Reads an external journal from the named file.
-b blocknumber Uses the backup superblock at blocknumber when opening
the file system.
-B blocksize Uses blocksize as the block size when opening the file
system. The number should be the number of bytes.