{ "content": [ { "type": "text", "text": "# dumpe2fs(8) (man)\n\n**Summary:** dumpe2fs - dump ext2/ext3/ext4 file system information\n\n**Synopsis:** dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device\n\n## Flags\n\n| Flag | Long | Arg | Description |\n|------|------|-----|-------------|\n| -b | — | — | |\n| -o | — | — | use the block superblock when examining the file system. This option is not usually needed except by a file system wizar |\n| -o | — | — | use blocks of blocksize bytes when examining the file system. This option is not usu‐ ally needed except by a file syste |\n| -f | — | — | ture flags which dumpe2fs may not understand (and which can cause some of dumpe2fs's display to be suspect). |\n| -g | — | — | format. The fields displayed are the group number; the number of the first block in the group; the superblock location ( |\n| -h | — | — | tail information. |\n| -i | — | — | the pathname to the image file. |\n| -m | — | — | node, see e2mmpstatus(8) for full details. If used together with the -i option, only the MMP block information is printe |\n| -x | — | — | |\n| -V | — | — | |\n\n## See Also\n\n- e2fsck(8)\n- e2mmpstatus(8)\n- mke2fs(8)\n- tune2fs(8)\n- ext4(5)\n\n## Section Outline\n\n- **NAME** (2 lines)\n- **SYNOPSIS** (2 lines)\n- **DESCRIPTION** (6 lines)\n- **OPTIONS** (1 lines) — 10 subsections\n - -b (1 lines)\n - -o (4 lines)\n - -o (4 lines)\n - -f (3 lines)\n - -g (5 lines)\n - -h (2 lines)\n - -i (2 lines)\n - -m (3 lines)\n - -x (1 lines)\n - -V (1 lines)\n- **EXIT CODE** (4 lines)\n- **BUGS** (2 lines)\n- **AUTHOR** (3 lines)\n- **AVAILABILITY** (3 lines)\n- **SEE ALSO** (6 lines)\n\n## Full Content\n\n### NAME\n\ndumpe2fs - dump ext2/ext3/ext4 file system information\n\n### SYNOPSIS\n\ndumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device\n\n### DESCRIPTION\n\ndumpe2fs 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\n### OPTIONS\n\n#### -b\n\n#### -o\n\nuse 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\n#### -o\n\nuse 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\n#### -f\n\nture flags which dumpe2fs may not understand (and which can cause some of dumpe2fs's\ndisplay to be suspect).\n\n#### -g\n\nformat. 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\n#### -h\n\ntail information.\n\n#### -i\n\nthe pathname to the image file.\n\n#### -m\n\nnode, see e2mmpstatus(8) for full details. If used together with the -i option, only\nthe MMP block information is printed.\n\n#### -x\n\n#### -V\n\n### EXIT CODE\n\ndumpe2fs 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\n### BUGS\n\nYou may need to know the physical file system structure to understand the output.\n\n### AUTHOR\n\ndumpe2fs was written by Remy Card . It is currently being maintained by\nTheodore Ts'o .\n\n### AVAILABILITY\n\ndumpe2fs is part of the e2fsprogs package and is available from http://e2fsprogs.source‐\nforge.net.\n\n### SEE ALSO\n\ne2fsck(8), e2mmpstatus(8), mke2fs(8), tune2fs(8). ext4(5)\n\n\n\n\nE2fsprogs version 1.46.5 December 2021 DUMPE2FS(8)\n\n" } ], "structuredContent": { "command": "dumpe2fs", "section": "8", "mode": "man", "summary": "dumpe2fs - dump ext2/ext3/ext4 file system information", "synopsis": "dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device", "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" } ], "section_outline": [ { "name": "NAME", "lines": 2, "subsections": [] }, { "name": "SYNOPSIS", "lines": 2, "subsections": [] }, { "name": "DESCRIPTION", "lines": 6, "subsections": [] }, { "name": "OPTIONS", "lines": 1, "subsections": [ { "name": "-b", "lines": 1, "flag": "-b" }, { "name": "-o", "lines": 4, "flag": "-o" }, { "name": "-o", "lines": 4, "flag": "-o" }, { "name": "-f", "lines": 3, "flag": "-f" }, { "name": "-g", "lines": 5, "flag": "-g" }, { "name": "-h", "lines": 2, "flag": "-h" }, { "name": "-i", "lines": 2, "flag": "-i" }, { "name": "-m", "lines": 3, "flag": "-m" }, { "name": "-x", "lines": 1, "flag": "-x" }, { "name": "-V", "lines": 1, "flag": "-V" } ] }, { "name": "EXIT CODE", "lines": 4, "subsections": [] }, { "name": "BUGS", "lines": 2, "subsections": [] }, { "name": "AUTHOR", "lines": 3, "subsections": [] }, { "name": "AVAILABILITY", "lines": 3, "subsections": [] }, { "name": "SEE ALSO", "lines": 6, "subsections": [] } ] } }