{
    "mode": "man",
    "parameter": "dumpe2fs",
    "section": "8",
    "url": "https://www.chedong.com/phpMan.php/man/dumpe2fs/8/json",
    "generated": "2026-05-30T07:10:22Z",
    "synopsis": "dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device",
    "sections": {
        "NAME": {
            "content": "dumpe2fs - dump ext2/ext3/ext4 file system information\n",
            "subsections": []
        },
        "SYNOPSIS": {
            "content": "dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "dumpe2fs  prints  the super block and blocks group information for the file system present on\ndevice.\n\nNote: When used with a mounted file system, the printed information may be old  or  inconsis‐\ntent.\n",
            "subsections": []
        },
        "OPTIONS": {
            "content": "",
            "subsections": [
                {
                    "name": "-b",
                    "content": "",
                    "flag": "-b"
                },
                {
                    "name": "-o",
                    "content": "use  the  block superblock when examining the file system.  This option is not usually\nneeded except by a file system wizard who is examining the remains  of  a  very  badly\ncorrupted file system.\n",
                    "flag": "-o"
                },
                {
                    "name": "-o",
                    "content": "use blocks of blocksize bytes when examining the file system.  This option is not usu‐\nally needed except by a file system wizard who is examining  the  remains  of  a  very\nbadly corrupted file system.\n",
                    "flag": "-o"
                },
                {
                    "name": "-f",
                    "content": "ture flags which dumpe2fs may not understand (and which can cause some  of  dumpe2fs's\ndisplay to be suspect).\n",
                    "flag": "-f"
                },
                {
                    "name": "-g",
                    "content": "format.  The fields displayed are the group number; the number of the first  block  in\nthe group; the superblock location (or -1 if not present); the range of blocks used by\nthe group descriptors (or -1 if not present); the block  bitmap  location;  the  inode\nbitmap location; and the range of blocks used by the inode table.\n",
                    "flag": "-g"
                },
                {
                    "name": "-h",
                    "content": "tail information.\n",
                    "flag": "-h"
                },
                {
                    "name": "-i",
                    "content": "the pathname to the image file.\n",
                    "flag": "-i"
                },
                {
                    "name": "-m",
                    "content": "node, see e2mmpstatus(8) for full details.  If used together with the -i option,  only\nthe MMP block information is printed.\n",
                    "flag": "-m"
                },
                {
                    "name": "-x",
                    "content": "",
                    "flag": "-x"
                },
                {
                    "name": "-V",
                    "content": "",
                    "flag": "-V"
                }
            ]
        },
        "EXIT CODE": {
            "content": "dumpe2fs  exits  with  a return code of 0 if the operation completed without errors.  It will\nexit with a non-zero return code if there are any errors, such as problems  reading  a  valid\nsuperblock, bad checksums, or if the device is in use by another node and -m is specified.\n",
            "subsections": []
        },
        "BUGS": {
            "content": "You may need to know the physical file system structure to understand the output.\n",
            "subsections": []
        },
        "AUTHOR": {
            "content": "dumpe2fs was written by Remy Card <Remy.Card@linux.org>.  It is currently being maintained by\nTheodore Ts'o <tytso@alum.mit.edu>.\n",
            "subsections": []
        },
        "AVAILABILITY": {
            "content": "dumpe2fs is part of the e2fsprogs package  and  is  available  from  http://e2fsprogs.source‐\nforge.net.\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "e2fsck(8), e2mmpstatus(8), mke2fs(8), tune2fs(8).  ext4(5)\n\n\n\n\nE2fsprogs version 1.46.5                    December 2021                                DUMPE2FS(8)",
            "subsections": []
        }
    },
    "summary": "dumpe2fs - dump ext2/ext3/ext4 file system information",
    "flags": [
        {
            "flag": "-b",
            "long": null,
            "arg": null,
            "description": ""
        },
        {
            "flag": "-o",
            "long": null,
            "arg": null,
            "description": "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."
        },
        {
            "flag": "-o",
            "long": null,
            "arg": null,
            "description": "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."
        },
        {
            "flag": "-f",
            "long": null,
            "arg": null,
            "description": "ture flags which dumpe2fs may not understand (and which can cause some of dumpe2fs's display to be suspect)."
        },
        {
            "flag": "-g",
            "long": null,
            "arg": null,
            "description": "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."
        },
        {
            "flag": "-h",
            "long": null,
            "arg": null,
            "description": "tail information."
        },
        {
            "flag": "-i",
            "long": null,
            "arg": null,
            "description": "the pathname to the image file."
        },
        {
            "flag": "-m",
            "long": null,
            "arg": null,
            "description": "node, see e2mmpstatus(8) for full details. If used together with the -i option, only the MMP block information is printed."
        },
        {
            "flag": "-x",
            "long": null,
            "arg": null,
            "description": ""
        },
        {
            "flag": "-V",
            "long": null,
            "arg": null,
            "description": ""
        }
    ],
    "examples": [],
    "see_also": [
        {
            "name": "e2fsck",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/e2fsck/8/json"
        },
        {
            "name": "e2mmpstatus",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/e2mmpstatus/8/json"
        },
        {
            "name": "mke2fs",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/mke2fs/8/json"
        },
        {
            "name": "tune2fs",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/tune2fs/8/json"
        },
        {
            "name": "ext4",
            "section": "5",
            "url": "https://www.chedong.com/phpMan.php/man/ext4/5/json"
        }
    ]
}