{ "content": [ { "type": "text", "text": "# DUMPE2FS (man)\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\n## TLDR\n\n> Print the super block and blocks group information for ext2/ext3/ext4 filesystems.\n\n- Display ext2, ext3, and ext4 filesystem information:\n `dumpe2fs {{/dev/sdXN}}`\n- Display the blocks which are reserved as bad in the filesystem:\n `dumpe2fs -b {{/dev/sdXN}}`\n- Force display filesystem information even with unrecognizable feature flags:\n `dumpe2fs -f {{/dev/sdXN}}`\n- Only display the superblock information and not any of the block group descriptor detail information:\n `dumpe2fs -h {{/dev/sdXN}}`\n- Print the detailed group information block numbers in hexadecimal format:\n `dumpe2fs -x {{/dev/sdXN}}`\n\n*Source: tldr-pages*\n\n## Sections\n\n- **NAME**\n- **SYNOPSIS**\n- **DESCRIPTION**\n- **OPTIONS** (10 subsections)\n- **EXIT CODE**\n- **BUGS**\n- **AUTHOR**\n- **AVAILABILITY**\n- **SEE ALSO**\n\nUse structuredContent.sections for detailed options, examples, and full documentation.\n" } ], "structuredContent": { "command": "DUMPE2FS", "section": "", "mode": "man", "summary": "dumpe2fs - dump ext2/ext3/ext4 file system information", "synopsis": "dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device", "tldr_summary": "Print the super block and blocks group information for ext2/ext3/ext4 filesystems.", "tldr_examples": [ { "description": "Display ext2, ext3, and ext4 filesystem information", "command": "dumpe2fs {{/dev/sdXN}}" }, { "description": "Display the blocks which are reserved as bad in the filesystem", "command": "dumpe2fs -b {{/dev/sdXN}}" }, { "description": "Force display filesystem information even with unrecognizable feature flags", "command": "dumpe2fs -f {{/dev/sdXN}}" }, { "description": "Only display the superblock information and not any of the block group descriptor detail information", "command": "dumpe2fs -h {{/dev/sdXN}}" }, { "description": "Print the detailed group information block numbers in hexadecimal format", "command": "dumpe2fs -x {{/dev/sdXN}}" } ], "tldr_source": "official", "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": [] } ], "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 . It is currently being maintained by\nTheodore Ts'o .\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": [] } } } }