Linux Commands Examples

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dumpe2fs

dump ext2/ext3/ext4 filesystem information


see also : e2fsck - mke2fs - tune2fs

Synopsis

dumpe2fs [ -bfhixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device


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examples

1
source 
            

  read partition




  sudo dumpe2fs -h $partition |
  grep -i 'mount count'
0
source 
            

  exit 1




  fi








  dumpe2fs $1 | grep Free | head
  -2
0
source 
            



  sudo dumpe2fs $1 | grep Free
0
source 
            

  MAN8="debugfs badblocks e2fsck mke2fs dumpe2fs
  mklost+found \




  fsck tune2fs"




  MAN1="lsattr chattr"






  for i in $MAN8




  do




  man -S 8 $i > /dev/null
0
source 
            

  sudo dumpe2fs -h $PARTITION |
  grep 'Filesystem volume name' >>
  .temp.$$




  sudo dumpe2fs -h $PARTITION |
  grep 'Mount count' >>
  .temp.$$




  sudo dumpe2fs -h $PARTITION |
  grep 'Maximum mount count' >>
  .temp.$$




  sudo dumpe2fs -h $PARTITION |
  grep 'Last mount time' >>
  .temp.$$

description

dumpe2fs prints the super block and blocks group information for the filesystem present on device.

Note: When used with a mounted filesystem, the printed information may be old or inconsistent.

options

-b

print the blocks which are reserved as bad in the filesystem.

-o superblock=superblock

use the block superblock when examining the filesystem. This option is not usually needed except by a filesystem wizard who is examining the remains of a very badly corrupted filesystem.

-o blocksize=blocksize

use blocks of blocksize bytes when examining the filesystem. This option is not usually needed except by a filesystem wizard who is examining the remains of a very badly corrupted filesystem.

-f

force dumpe2fs to display a filesystem even though it may have some filesystem feature flags which dumpe2fs may not understand (and which can cause some of dumpe2fs’s display to be suspect).

-h

only display the superblock information and not any of the block group descriptor detail information.

-i

display the filesystem data from an image file created by e2image, using device as the pathname to the image file.

-x

print the detailed group information block numbers in hexadecimal format

-V

print the version number of dumpe2fs and exit.

availability

dumpe2fs is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net.


bugs

You need to know the physical filesystem structure to understand the output.


see also

e2fsck , mke2fs , tune2fs


author

dumpe2fs was written by Remy Card <Remy.Card[:at:]linux[:dot:]org>. It is currently being maintained by Theodore Ts’o <tytso[:at:]alum.mit[:dot:]edu>.

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