NAME

       lsblk - list block devices

SYNOPSIS

       lsblk [options] [device...]

DESCRIPTION

       lsblk  lists information about all available or the specified block devices.  The lsblk command reads the
       sysfs filesystem and udev db to gather information. If the udev db is not available or lsblk is  compiled
       without  udev  support than it tries to read LABELs, UUIDs and filesystem types from the block device. In
       this case root permissions are necessary.

       The command prints all block devices (except RAM disks) in a tree-like  format  by  default.   Use  lsblk
       --help to get a list of all available columns.

       The  default  output,  as well as the default output from options like --fs and --topology, is subject to
       change.  So whenever possible, you should avoid using default outputs in your scripts.  Always explicitly
       define expected columns by using --output columns-list and --list in environments where a  stable  output
       is required.

       Note that lsblk might be executed in time when udev does not have all information about recently added or
       modified  devices  yet.  In this case it is recommended to use udevadm settle before lsblk to synchronize
       with udev.

OPTIONS

       -a, --all
              Also list empty devices and RAM disk devices.

       -b, --bytes
              Print the SIZE column in bytes rather than in a human-readable format.

       -D, --discard
              Print information about the discarding capabilities (TRIM, UNMAP) for each device.

       -d, --nodeps
              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.

       -f, --fs
              Output info about filesystems.  This option is equivalent to -o NAME,FSTYPE,LABEL,UUID,MOUNTPOINT.
              The authoritative information about filesystems and raids is provided by the blkid(8) command.

       -h, --help
              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.

       -i, --ascii
              Use ASCII characters for tree formatting.

       -J, --json
              Use JSON output format.  It's strongly recommended to use --output and also --tree if necessary.

       -l, --list
              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.

       -M, --merge
              Group parents of sub-trees to provide more readable output for RAIDs and Multi-path  devices.  The
              tree-like output is required.

       -m, --perms
              Output   info   about   device   owner,   group   and   mode.    This   option  is  equivalent  to
              -o NAME,SIZE,OWNER,GROUP,MODE.

       -n, --noheadings
              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).

       -O, --output-all
              Output all available columns.

       -P, --pairs
              Produce  output  in  the  form  of  key="value" pairs.  All potentially unsafe characters are hex-
              escaped (\x<code>).

       -p, --paths
              Print full device paths.

       -r, --raw
              Produce output in raw format.  All potentially unsafe characters are hex-escaped (\x<code>) in the
              NAME, KNAME, LABEL, PARTLABEL and MOUNTPOINT columns.

       -S, --scsi
              Output info about SCSI devices only.  All partitions, slaves and holder devices are ignored.

       -s, --inverse
              Print dependencies in inverse order. If the --list output is requested then the  lines  are  still
              ordered by dependencies.

       -T, --tree[=column]
              Force tree-like output format.  If column is specified, then a tree is printed in the column.  The
              default is NAME column.

       -t, --topology
              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.

       -V, --version
              Display version information and exit.

       -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.

       -z, --zoned
              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.  This option is
              designed for the testing purpose.

NOTES

       For partitions, some information (e.g. queue attributes) is inherited from the parent device.

       The lsblk command needs to be able to look up each block device by major:minor numbers, which is done  by
       using  /sys/dev/block.   This sysfs block directory appeared in kernel 2.6.27 (October 2008).  In case of
       problems with a new enough kernel, check that CONFIG_SYSFS was enabled at the time of the kernel build.

RETURN CODES

       0      success

       1      failure

       32     none of specified devices found

       64     some specified devices found, some not found

AUTHORS

       Milan Broz <mbroz@redhat.com>
       Karel Zak <kzak@redhat.com>

ENVIRONMENT

       LSBLK_DEBUG=all
              enables lsblk debug output.

       LIBBLKID_DEBUG=all
              enables libblkid debug output.

       LIBMOUNT_DEBUG=all
              enables libmount debug output.

       LIBSMARTCOLS_DEBUG=all
              enables libsmartcols debug output.

       LIBSMARTCOLS_DEBUG_PADDING=on
              use visible padding characters. Requires enabled LIBSMARTCOLS_DEBUG.

SEE ALSO

       ls(1), blkid(8), findmnt(8)

AVAILABILITY

       The   lsblk   command   is   part    of    the    util-linux    package    and    is    available    from
       https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux                                        February 2013                                         LSBLK(8)