LSBLK(8)						       System Administration							  LSBLK(8)

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 to gather infor-
       mation.

       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  in  environ-
       ments where a stable output is required.

OPTIONS

       -a, --all
	      Also list empty devices.	(By default they are skipped.)

       -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, --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.	The filter is applied to the top-level devices only.

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

       -h, --help
	      Print a 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.

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

       -l, --list
	      Produce output in the form of a list.

       -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 default list of columns may be extended if list is specified in the format +list (e.g. lsblk -o +UUID).

       -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.

       -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,WSAME.

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

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.

AUTHORS

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

ENVIRONMENT

       Setting LIBMOUNT_DEBUG=0xffff enables debug output.

SEE ALSO

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

AVAILABILITY

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

util-linux							   February 2013							  LSBLK(8)