dumpe2fs命令

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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/sda1dumpe2fs 1.41.12 (17-May-2010)Filesystem volume name:   <none>Last mounted on:          /bootFilesystem UUID:          d1488e05-0442-4514-82ff-5f877a51df23Filesystem magic number:  0xEF53Filesystem 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_isizeFilesystem flags:         signed_directory_hashDefault mount options:    user_xattr aclFilesystem state:         cleanErrors behavior:          ContinueFilesystem OS type:       LinuxInode count:              128016Block count:              512000Reserved block count:     25600Free blocks:              465996Free inodes:              127978First block:              1Block size:               1024Fragment size:            1024Reserved GDT blocks:      256Blocks per group:         8192Fragments per group:      8192Inodes per group:         2032Inode blocks per group:   254Flex block group size:    16Filesystem created:       Tue Apr 15 04:22:51 2014Last mount time:          Tue Sep 16 01:22:26 2014Last write time:          Tue Sep 16 01:22:26 2014Mount count:              5Maximum mount count:      -1Last checked:             Tue Apr 15 04:22:51 2014Check interval:           0 (<none>)Lifetime writes:          43 MBReserved blocks uid:      0 (user root)Reserved blocks gid:      0 (group root)First inode:              11Inode size:               128Journal inode:            8Default directory hash:   half_md4Directory Hash Seed:      f562772f-0825-4753-a0b1-5bc295821472Journal backup:           inode blocksJournal features:         (none)Journal size:             8MJournal length:           8192Journal sequence:         0x00000018Journal start:            0Group 0: (Blocks 1-8192) [ITABLE_ZEROED]  Checksum 0xcdec, unused inodes 2015...................略

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