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.
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 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. (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
- 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.
- -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).
- -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.
- -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
- Display version information and exit.
- -x, --sort column
- Sort output lines by output column.
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/.