使用linux难免遇到误删文件的情况，使用extundlete 即可恢复误删文件
记下操作流程：
1. 安装Linux数据恢复软件extundelete
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。
使用方法：
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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.
恢复分区所有的文件
# extundelete /dev/sda1 –-restore-all
恢复单个文件
# extundelete /dev/sda3 --restore-file /root/aaa.file
恢复单个目录
# extundelete /dev/sdb1 --restore-directory /root/aaa
恢复的文件在当前位置的RECOVERED_FILES目录下。