# dumpe2fs - dump ext2/ext3/ext4 file system information - man(8) - [phpMan]

[_DUMPE2FS_(8)](https://www.chedong.com/phpMan.php/man/DUMPE2FS/8/markdown)                            System Manager's Manual                           [_DUMPE2FS_(8)](https://www.chedong.com/phpMan.php/man/DUMPE2FS/8/markdown)

## NAME
       dumpe2fs - dump ext2/ext3/ext4 file system information

## SYNOPSIS
       **dumpe2fs **[ **-bfghixV **] [ **-o superblock=_**superblock_ ] [ **-o blocksize=_**blocksize_ ] _device_

## DESCRIPTION
       **dumpe2fs  **prints  the super block and blocks group information for the file system present on
       _device._

       **Note: **When used with a mounted file system, the printed information may be old  or  inconsis‐
       tent.

## OPTIONS
### -b     

### -o superblock=_
              use  the  block _superblock_ when examining the file system.  This option is not usually
              needed except by a file system wizard who is examining the remains  of  a  very  badly
              corrupted file system.

### -o blocksize=_
              use blocks of _blocksize_ bytes when examining the file system.  This option is not usu‐
              ally  needed  except  by  a  file system wizard who is examining the remains of a very
              badly corrupted file system.

### -f     
              ture  flags  which dumpe2fs may not understand (and which can cause some of dumpe2fs's
              display to be suspect).

### -g     
              format.   The  fields displayed are the group number; the number of the first block in
              the group; the superblock location (or -1 if not present); the range of blocks used by
              the group descriptors (or -1 if not present); the block  bitmap  location;  the  inode
              bitmap location; and the range of blocks used by the inode table.

### -h     
              tail information.

### -i     
              the pathname to the image file.

### -m     
              node,  see [**e2mmpstatus**(8)](https://www.chedong.com/phpMan.php/man/e2mmpstatus/8/markdown) for full details.  If used together with the **-i **option, only
              the MMP block information is printed.

### -x     

### -V     

## EXIT CODE
       **dumpe2fs **exits with a return code of 0 if the operation completed without  errors.   It  will
       exit  with  a  non-zero return code if there are any errors, such as problems reading a valid
       superblock, bad checksums, or if the device is in use by another node and **-m **is specified.

## BUGS
       You may need to know the physical file system structure to understand the output.

## AUTHOR
       **dumpe2fs **was written by Remy Card <<Remy.Card@linux.org>>.  It is currently being maintained by
       Theodore Ts'o <<tytso@alum.mit.edu>>.

## AVAILABILITY
       **dumpe2fs **is part of the e2fsprogs package  and  is  available  from  <http://e2fsprogs.source>‐
       forge.net.

## SEE ALSO
       [**e2fsck**(8)](https://www.chedong.com/phpMan.php/man/e2fsck/8/markdown), [**e2mmpstatus**(8)](https://www.chedong.com/phpMan.php/man/e2mmpstatus/8/markdown), [**mke2fs**(8)](https://www.chedong.com/phpMan.php/man/mke2fs/8/markdown), [**tune2fs**(8)](https://www.chedong.com/phpMan.php/man/tune2fs/8/markdown).  [**ext4**(5)](https://www.chedong.com/phpMan.php/man/ext4/5/markdown)


E2fsprogs version 1.47.0                    February 2023                                [_DUMPE2FS_(8)](https://www.chedong.com/phpMan.php/man/DUMPE2FS/8/markdown)