{ "mode": "info", "parameter": "LSBLK", "section": "", "url": "https://www.chedong.com/phpMan.php/info/LSBLK/json", "generated": "2026-07-05T23:44:14Z", "synopsis": "lsblk [options] [device...]", "sections": { "NAME": { "content": "lsblk - list block devices\n", "subsections": [] }, "SYNOPSIS": { "content": "lsblk [options] [device...]\n", "subsections": [] }, "DESCRIPTION": { "content": "lsblk lists information about all available or the specified block\ndevices. The lsblk command reads the sysfs filesystem and udev db to\ngather information. If the udev db is not available or lsblk is\ncompiled without udev support, then it tries to read LABELs, UUIDs and\nfilesystem types from the block device. In this case root permissions\nare necessary.\n\nThe command prints all block devices (except RAM disks) in a tree-like\nformat by default. Use lsblk --help to get a list of all available\ncolumns.\n\nThe default output, as well as the default output from options like\n--fs and --topology, is subject to change. So whenever possible, you\nshould avoid using default outputs in your scripts. Always explicitly\ndefine expected columns by using --output columns-list and --list in\nenvironments where a stable output is required.\n\nNote that lsblk might be executed in time when udev does not have all\ninformation about recently added or modified devices yet. In this case\nit is recommended to use udevadm settle before lsblk to synchronize\nwith udev.\n\nThe relationship between block devices and filesystems is not always\none-to-one. The filesystem may use more block devices, or the same\nfilesystem may be accessible by more paths. This is the reason why\nlsblk provides MOUNTPOINT and MOUNTPOINTS (pl.) columns. The column\nMOUNTPOINT displays only one mount point (usually the last mounted\ninstance of the filesystem), and the column MOUNTPOINTS displays by\nmulti-line cell all mount points associated with the device.\n", "subsections": [] }, "OPTIONS": { "content": "", "subsections": [ { "name": "-a, --all", "content": "Also list empty devices and RAM disk devices.\n", "flag": "-a", "long": "--all" }, { "name": "-b, --bytes", "content": "Print the SIZE column in bytes rather than in a human-readable\nformat.\n", "flag": "-b", "long": "--bytes" }, { "name": "-D, --discard", "content": "Print information about the discarding capabilities (TRIM, UNMAP)\nfor each device.\n", "flag": "-D", "long": "--discard" }, { "name": "-d, --nodeps", "content": "Do not print holder devices or slaves. For example, lsblk --nodeps\n/dev/sda prints information about the sda device only.\n\n-E, --dedup column\nUse column as a de-duplication key to de-duplicate output tree. If\nthe key is not available for the device, or the device is a\npartition and parental whole-disk device provides the same key than\nthe device is always printed.\n\nThe usual use case is to de-duplicate output on system multi-path\ndevices, for example by -E WWN.\n\n-e, --exclude list\nExclude the devices specified by the comma-separated list of major\ndevice numbers. Note that RAM disks (major=1) are excluded by\ndefault if --all is not specified. The filter is applied to the\ntop-level devices only. This may be confusing for --list output\nformat where hierarchy of the devices is not obvious.\n", "flag": "-d", "long": "--nodeps" }, { "name": "-f, --fs", "content": "Output info about filesystems. This option is equivalent to -o\nNAME,FSTYPE,FSVER,LABEL,UUID,FSAVAIL,FSUSE%,MOUNTPOINTS. The\nauthoritative information about filesystems and raids is provided\nby the blkid(8) command.\n", "flag": "-f", "long": "--fs" }, { "name": "-h, --help", "content": "Display help text and exit.\n\n-I, --include list\nInclude devices specified by the comma-separated list of major\ndevice numbers. The filter is applied to the top-level devices\nonly. This may be confusing for --list output format where\nhierarchy of the devices is not obvious.\n", "flag": "-h", "long": "--help" }, { "name": "-i, --ascii", "content": "Use ASCII characters for tree formatting.\n", "flag": "-i", "long": "--ascii" }, { "name": "-J, --json", "content": "Use JSON output format. It's strongly recommended to use --output\nand also --tree if necessary.\n", "flag": "-J", "long": "--json" }, { "name": "-l, --list", "content": "Produce output in the form of a list. The output does not provide\ninformation about relationships between devices and since version\n2.34 every device is printed only once if --pairs or --raw not\nspecified (the parsable outputs are maintained in backwardly\ncompatible way).\n", "flag": "-l", "long": "--list" }, { "name": "-M, --merge", "content": "Group parents of sub-trees to provide more readable output for\nRAIDs and Multi-path devices. The tree-like output is required.\n", "flag": "-M", "long": "--merge" }, { "name": "-m, --perms", "content": "Output info about device owner, group and mode. This option is\nequivalent to -o NAME,SIZE,OWNER,GROUP,MODE.\n", "flag": "-m", "long": "--perms" }, { "name": "-n, --noheadings", "content": "Do not print a header line.\n\n-o, --output list\nSpecify which output columns to print. Use --help to get a list of\nall supported columns. The columns may affect tree-like output. The\ndefault is to use tree for the column 'NAME' (see also --tree).\n\nThe default list of columns may be extended if list is specified in\nthe format +list (e.g., lsblk -o +UUID).\n", "flag": "-n", "long": "--noheadings" }, { "name": "-O, --output-all", "content": "Output all available columns.\n", "flag": "-O", "long": "--output-all" }, { "name": "-P, --pairs", "content": "Produce output in the form of key=\"value\" pairs. The output lines\nare still ordered by dependencies. All potentially unsafe value\ncharacters are hex-escaped (\\x).\n", "flag": "-P", "long": "--pairs" }, { "name": "-p, --paths", "content": "Print full device paths.\n", "flag": "-p", "long": "--paths" }, { "name": "-r, --raw", "content": "Produce output in raw format. The output lines are still ordered by\ndependencies. All potentially unsafe characters are hex-escaped\n(\\x) in the NAME, KNAME, LABEL, PARTLABEL and MOUNTPOINT\ncolumns.\n", "flag": "-r", "long": "--raw" }, { "name": "-S, --scsi", "content": "Output info about SCSI devices only. All partitions, slaves and\nholder devices are ignored.\n", "flag": "-S", "long": "--scsi" }, { "name": "-s, --inverse", "content": "Print dependencies in inverse order. If the --list output is\nrequested then the lines are still ordered by dependencies.\n", "flag": "-s", "long": "--inverse" }, { "name": "-T, --tree[=column]", "content": "Force tree-like output format. If column is specified, then a tree\nis printed in the column. The default is NAME column.\n", "flag": "-T" }, { "name": "-t, --topology", "content": "Output info about block-device topology. This option is equivalent\nto\n\n-o\nNAME,ALIGNMENT,MIN-IO,OPT-IO,PHY-SEC,LOG-SEC,ROTA,SCHED,RQ-SIZE,RA,WSAME.\n", "flag": "-t", "long": "--topology" }, { "name": "-V, --version", "content": "Display version information and exit.\n\n-w, --width number\nSpecifies output width as a number of characters. The default is\nthe number of the terminal columns, and if not executed on a\nterminal, then output width is not restricted at all by default.\nThis option also forces lsblk to assume that terminal control\ncharacters and unsafe characters are not allowed. The expected\nuse-case is for example when lsblk is used by the watch(1) command.\n\n-x, --sort column\nSort output lines by column. This option enables --list output\nformat by default. It is possible to use the option --tree to force\ntree-like output and than the tree branches are sorted by the\ncolumn.\n", "flag": "-V", "long": "--version" }, { "name": "-z, --zoned", "content": "Print the zone model for each device.\n\n--sysroot directory\nGather data for a Linux instance other than the instance from which\nthe lsblk command is issued. The specified directory is the system\nroot of the Linux instance to be inspected. The real device nodes\nin the target directory can be replaced by text files with udev\nattributes.\n", "flag": "-z", "long": "--zoned" } ] }, "EXIT STATUS": { "content": "0\nsuccess\n\n1\nfailure\n\n32\nnone of specified devices found\n\n64\nsome specified devices found, some not found\n", "subsections": [] }, "ENVIRONMENT": { "content": "LSBLKDEBUG=all\nenables lsblk debug output.\n\nLIBBLKIDDEBUG=all\nenables libblkid debug output.\n\nLIBMOUNTDEBUG=all\nenables libmount debug output.\n\nLIBSMARTCOLSDEBUG=all\nenables libsmartcols debug output.\n\nLIBSMARTCOLSDEBUGPADDING=on\nuse visible padding characters.\n", "subsections": [] }, "NOTES": { "content": "For partitions, some information (e.g., queue attributes) is inherited\nfrom the parent device.\n\nThe lsblk command needs to be able to look up each block device by\nmajor:minor numbers, which is done by using /sys/dev/block. This sysfs\nblock directory appeared in kernel 2.6.27 (October 2008). In case of\nproblems with a new enough kernel, check that CONFIGSYSFS was enabled\nat the time of the kernel build.\n", "subsections": [] }, "AUTHORS": { "content": "Milan Broz , Karel Zak \n", "subsections": [] }, "SEE ALSO": { "content": "ls(1), blkid(8), findmnt(8)\n", "subsections": [] }, "REPORTING BUGS": { "content": "For bug reports, use the issue tracker at\nhttps://github.com/karelzak/util-linux/issues.\n", "subsections": [] }, "AVAILABILITY": { "content": "The lsblk command is part of the util-linux package which can be\ndownloaded from Linux Kernel Archive\n.\n\nutil-linux 2.37.2 2026-03-06 LSBLK(8)", "subsections": [] } }, "summary": "lsblk - list block devices", "flags": [ { "flag": "-a", "long": "--all", "arg": null, "description": "Also list empty devices and RAM disk devices." }, { "flag": "-b", "long": "--bytes", "arg": null, "description": "Print the SIZE column in bytes rather than in a human-readable format." }, { "flag": "-D", "long": "--discard", "arg": null, "description": "Print information about the discarding capabilities (TRIM, UNMAP) for each device." }, { "flag": "-d", "long": "--nodeps", "arg": null, "description": "Do not print holder devices or slaves. For example, lsblk --nodeps /dev/sda prints information about the sda device only. -E, --dedup column Use column as a de-duplication key to de-duplicate output tree. If the key is not available for the device, or the device is a partition and parental whole-disk device provides the same key than the device is always printed. The usual use case is to de-duplicate output on system multi-path devices, for example by -E WWN. -e, --exclude list Exclude the devices specified by the comma-separated list of major device numbers. Note that RAM disks (major=1) are excluded by default if --all is not specified. The filter is applied to the top-level devices only. This may be confusing for --list output format where hierarchy of the devices is not obvious." }, { "flag": "-f", "long": "--fs", "arg": null, "description": "Output info about filesystems. This option is equivalent to -o NAME,FSTYPE,FSVER,LABEL,UUID,FSAVAIL,FSUSE%,MOUNTPOINTS. The authoritative information about filesystems and raids is provided by the blkid(8) command." }, { "flag": "-h", "long": "--help", "arg": null, "description": "Display help text and exit. -I, --include list Include devices specified by the comma-separated list of major device numbers. The filter is applied to the top-level devices only. This may be confusing for --list output format where hierarchy of the devices is not obvious." }, { "flag": "-i", "long": "--ascii", "arg": null, "description": "Use ASCII characters for tree formatting." }, { "flag": "-J", "long": "--json", "arg": null, "description": "Use JSON output format. It's strongly recommended to use --output and also --tree if necessary." }, { "flag": "-l", "long": "--list", "arg": null, "description": "Produce output in the form of a list. The output does not provide information about relationships between devices and since version 2.34 every device is printed only once if --pairs or --raw not specified (the parsable outputs are maintained in backwardly compatible way)." }, { "flag": "-M", "long": "--merge", "arg": null, "description": "Group parents of sub-trees to provide more readable output for RAIDs and Multi-path devices. The tree-like output is required." }, { "flag": "-m", "long": "--perms", "arg": null, "description": "Output info about device owner, group and mode. This option is equivalent to -o NAME,SIZE,OWNER,GROUP,MODE." }, { "flag": "-n", "long": "--noheadings", "arg": null, "description": "Do not print a header line. -o, --output list Specify which output columns to print. Use --help to get a list of all supported columns. The columns may affect tree-like output. The default is to use tree for the column 'NAME' (see also --tree). The default list of columns may be extended if list is specified in the format +list (e.g., lsblk -o +UUID)." }, { "flag": "-O", "long": "--output-all", "arg": null, "description": "Output all available columns." }, { "flag": "-P", "long": "--pairs", "arg": null, "description": "Produce output in the form of key=\"value\" pairs. The output lines are still ordered by dependencies. All potentially unsafe value characters are hex-escaped (\\x)." }, { "flag": "-p", "long": "--paths", "arg": null, "description": "Print full device paths." }, { "flag": "-r", "long": "--raw", "arg": null, "description": "Produce output in raw format. The output lines are still ordered by dependencies. All potentially unsafe characters are hex-escaped (\\x) in the NAME, KNAME, LABEL, PARTLABEL and MOUNTPOINT columns." }, { "flag": "-S", "long": "--scsi", "arg": null, "description": "Output info about SCSI devices only. All partitions, slaves and holder devices are ignored." }, { "flag": "-s", "long": "--inverse", "arg": null, "description": "Print dependencies in inverse order. If the --list output is requested then the lines are still ordered by dependencies." }, { "flag": "-T", "long": null, "arg": null, "description": "Force tree-like output format. If column is specified, then a tree is printed in the column. The default is NAME column." }, { "flag": "-t", "long": "--topology", "arg": null, "description": "Output info about block-device topology. This option is equivalent to -o NAME,ALIGNMENT,MIN-IO,OPT-IO,PHY-SEC,LOG-SEC,ROTA,SCHED,RQ-SIZE,RA,WSAME." }, { "flag": "-V", "long": "--version", "arg": null, "description": "Display version information and exit. -w, --width number Specifies output width as a number of characters. The default is the number of the terminal columns, and if not executed on a terminal, then output width is not restricted at all by default. This option also forces lsblk to assume that terminal control characters and unsafe characters are not allowed. The expected use-case is for example when lsblk is used by the watch(1) command. -x, --sort column Sort output lines by column. This option enables --list output format by default. It is possible to use the option --tree to force tree-like output and than the tree branches are sorted by the column." }, { "flag": "-z", "long": "--zoned", "arg": null, "description": "Print the zone model for each device. --sysroot directory Gather data for a Linux instance other than the instance from which the lsblk command is issued. The specified directory is the system root of the Linux instance to be inspected. The real device nodes in the target directory can be replaced by text files with udev attributes." } ], "examples": [], "see_also": [ { "name": "ls", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ls/1/json" }, { "name": "blkid", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/blkid/8/json" }, { "name": "findmnt", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/findmnt/8/json" } ] }