dumpe2fs command in Linux with examples Last Updated : 15 May, 2019 Comments Improve Suggest changes Like Article Like Report dumpe2fs command is used to print the super block and blocks group information for the filesystem present on device. Can be used with ext2/ext3/ext4 filesystem for information. The printed information may be old or inconsistent when it is used with a mounted filesystem. Don't forget to unmount your partition before using this command. umount device Syntax: dumpe2fs [ -bfhixV ] [ -o superblock=superblock ] [ -o blocksize=block-size ] device Options: b : Used to get the blocks which are reserved as bad in the filesystem. o superblock=superblock : It uses the superblock during the examination of 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 : It uses the blocksize during the examination of filesystem. This option is not usually needed except by a filesystem wizard who is examining the remains of a very badly corrupted filesystem. f : Used to force dumpe2fs to display a filesystem even though it may have some filesystem feature flags which dumpe2fs may not understand. h : It will only display the superblock information and not any of the block group descriptor detail information. i : Used to show the filesystem data from an image file created by e2image, using device as the pathname to the image file. x : Display the detailed group information block numbers in hexadecimal format. V : Display the version number of dumpe2fs and exit. Superblock: It is a record of the characteristics of a filesystem. It includes information about size, block size, empty and the filled blocks. Linux also maintains a copy of its superblock< in memory. If you are unable to mount your device, this can be due to a Corrupted superblock. Examples: Displaying superblock information: sudo dumpe2fs -h /dev/sda3 Displaying Information of block groups: sudo dumpe2fs /dev/sda3 This displays information about block groups. Notice Primary superblock Observing more about superblocks: sudo dumpe2fs /dev/sda4 | grep -i superblock Displays all available superblocks with discriptors. Displaying the version of dumpe2fs: sudo dumpe2fs -V Comment More infoAdvertise with us V VivekAgrawal3 Follow Improve Article Tags : Linux-Unix Similar Reads dir command in Linux with examples The dir command in Linux is used to list the contents of a directory, providing an overview of the files and folders within it. How is the dir command different from ls?dir command differs from the ls command in the format of listing contents that is in default listing options. 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