dumpe2fs命令用于打印“ext2/ext3”文件系统的超级块和快组信息。
语法
dumpe2fs(选项)(参数)
选项
-b：打印文件系统中预留的块信息；
-ob<超级块>：指定检查文件系统时使用的超级块；
-OB<块大小>：检查文件系统时使用的指定的块大小；
-h：仅显示超级块信息；
-i：从指定的文件系统映像文件中读取文件系统信息；
-x：以16进制格式打印信息块成员。
参数
文件系统：指定要查看信息的文件系统。
实例
dumpe2fs /dev/hda1
dumpe2fs 1.39 (6-Feb-2018)
Filesystem volume name: /
last mounted on: <not available>
Filesystem UUID: 845ccd40-1f3b-4729-a63d-cb80f51b082a
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 5242880
Block count: 5241817
Reserved block count: 262090
free blocks: 4434157
Free inodes: 5170836
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 1022
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 32768
Inode blocks per group: 1024
Filesystem created: Sun Mar 24 02:09:14 2017
Last mount time: Thu Aug 1 16:42:07 2017
Last write time: Thu Aug 1 16:42:07 2017
Mount count: 10
Maximum mount count: -1
Last checked: Sun Mar 24 02:09:14 2017
Check interval: 0 (<none>)
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
First orphan inode: 3735559
Default directory hash: tea
Directory Hash Seed: e3f7162e-1194-4161-805d-763db89dbc69
Journal backup: inode blocks
Journal size: 128M
Group 0: (Blocks 0-32767)
Primary superblock at 0, Group descriptors at 1-2
Reserved GDT blocks at 3-1024
Block bitmap at 1025 (+1025), Inode bitmap at 1026 (+1026)
Inode table at 1027-2050 (+1027)
0 free blocks, 32757 free inodes, 2 directories
Free blocks:
Free inodes: 12-32768
...
