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DUMPE2FS(8) System Manager's Manual DUMPE2FS(8)

📖 NAME

dumpe2fs - dump ext2/ext3/ext4 file system information

🚀 Quick Reference

Use Case	Command	Description
Display file system information	dumpe2fs /dev/sda1	Show superblock and group info
Display bad blocks	dumpe2fs -b /dev/sda1	Print reserved bad blocks
Display superblock only	dumpe2fs -h /dev/sda1	Show only superblock
Machine-readable format	dumpe2fs -g /dev/sda1	Group descriptors in CSV
Force display	dumpe2fs -f /dev/sda1	Force even if unknown features
From image file	dumpe2fs -i /path/to/image	Read from e2image file
Check MMP status	dumpe2fs -m /dev/sda1	Check if device is in use (if MMP enabled)
Hexadecimal output	dumpe2fs -x /dev/sda1	Print group info in hex
Version	dumpe2fs -V	Print version and exit

🔧 SYNOPSIS

dumpe2fs  [  -bfghixV  ]  [  -o  superblock=superblock  ]  [  -o block‐size=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: 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.
• -V — ℹ️ print the version number of dumpe2fs and exit.

🚪 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 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)

E2fsprogs version 1.46.5 December 2021 DUMPE2FS(8)

📖 NAME 🚀 Quick Reference 🔧 SYNOPSIS 📝 DESCRIPTION ⚙️ OPTIONS 🚪 EXIT CODE 🐛 BUGS 👤 AUTHOR 📦 AVAILABILITY 🔗 SEE ALSO