转自：http://www.shellcn.net/linux_command/linux_dumpe2fs.html
命令名称
dumpe2fs - 显示ext2/ext3/ext4文件系统信息。
dumpe2fs命令语法
dumpe2fs [ -bfhixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device
语法看起来比较复杂，看不懂的直接看下面的常用命令选项和实例。
dumpe2fs命令描述
显示device中文件系统的超级块和块组信息。
dumpe2fs常用命令选项
| 选项 | 描述 |
| -b | 打印文件系统中的坏块 |
| -o | 不常用，检查严重损坏文件系统时指定 |
| -f | 强制显示所有信息，即便dumpe2fs对有些文件系统功能标识不能识别。 |
| - i | 显示image文件系统信息。device指定image文件的路径 |
| -h | 只显示超级块信息 |
| -x | 将已分组的块的数量用十六进制显示 |
| -v | 显示dumpe2fs的版本号并推出 |
dumpe2fs命令实例
dumpe2fs查看/dev/sda1的文件系统信息。
[root@localhost ~]# dumpe2fs /dev/sda1 dumpe2fs 1.41.12 (17-May-2010) Filesystem volume name: <none> Last mounted on: /boot Filesystem UUID: d1488e05-0442-4514-82ff-5f877a51df23 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 128016 Block count: 512000 Reserved block count: 25600 Free blocks: 465996 Free inodes: 127978 First block: 1 Block size: 1024 Fragment size: 1024 Reserved GDT blocks: 256 Blocks per group: 8192 Fragments per group: 8192 Inodes per group: 2032 Inode blocks per group: 254 Flex block group size: 16 Filesystem created: Tue Apr 15 04:22:51 2014 Last mount time: Tue Sep 16 01:22:26 2014 Last write time: Tue Sep 16 01:22:26 2014 Mount count: 5 Maximum mount count: -1 Last checked: Tue Apr 15 04:22:51 2014 Check interval: 0 (<none>) Lifetime writes: 43 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: f562772f-0825-4753-a0b1-5bc295821472 Journal backup: inode blocks Journal features: (none) Journal size: 8M Journal length: 8192 Journal sequence: 0x00000018 Journal start: 0 Group 0: (Blocks 1-8192) [ITABLE_ZEROED] Checksum 0xcdec, unused inodes 2015 ...................略