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📝 NAME

dumpe2fs - dump ext2/ext3/ext4 file system information

🚀 Quick Reference

Use Case	Command	Description
📋 Display filesystem info	dumpe2fs /dev/sda1	Print superblock and block group details
🛑 Display bad blocks	dumpe2fs -b /dev/sda1	List blocks marked as bad
🔍 Superblock only	dumpe2fs -h /dev/sda1	Show only superblock information
💾 From image file	dumpe2fs -i image_file.img	Read from e2image backup
🔒 MMP check	dumpe2fs -m /dev/sda1	Check if device is in use by another node
🔢 Hex format	dumpe2fs -x /dev/sda1	Display block numbers in hexadecimal
⚙️ Custom superblock	dumpe2fs -o superblock=16384 /dev/sda1	Use alternate superblock location
📏 Custom blocksize	dumpe2fs -o blocksize=4096 /dev/sda1	Use specific block size in bytes

🔧 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 inconsistent.

⚙️ OPTIONS

🛑 -b

Print the blocks which are reserved as bad in the file system.

⚙️ -o superblock=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=blocksize

Use blocks of blocksize bytes 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.

💪 -f

Force dumpe2fs to display a file system even though it may have some file system feature flags which dumpe2fs may not understand (and which can cause some of dumpe2fs's display to be suspect).

📊 -g

Display the group descriptor information in a machine readable colon-separated value 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

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

💾 -i

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

🔒 -m

If the mmp feature is enabled on the file system, check if device is in use by another node, see e2mmpstatus(8) for full details. If used together with the -i option, only the MMP block information is printed.

🔢 -x

Print the detailed group information block numbers in hexadecimal format.

ℹ️ -V

Print the version number of dumpe2fs and exit.

🚪 Exit Codes

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 AT linux.org>. It is currently being maintained by Theodore Ts'o <tytso AT alum.edu>.

📦 AVAILABILITY

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

📚 SEE ALSO

e2fsck(8), e2mmpstatus(8), mke2fs(8), tune2fs(8), ext4(5)

📝 NAME 🚀 Quick Reference 🔧 SYNOPSIS 📖 DESCRIPTION ⚙️ OPTIONS 🚪 Exit Codes 🐛 BUGS 👤 AUTHOR 📦 AVAILABILITY 📚 SEE ALSO