lsblk — list block devices
lsblk
[options]
lsblk
[options]
device...
lsblk lists information about all or the specified block devices. The lsblk command reads the sysfs filesystem 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.
−a,
−−all
List all block devices.
−b,
−−bytes
Print the SIZE column in bytes rather than in human-readable format.
−d,
−−nodeps
Don't print device holders or slaves. For example "lsblk --nodeps /dev/sda" prints information about the sda device only.
−D,
−−discard
Print information about the discard (TRIM, UNMAP) capabilities for each device.
−e,
−−exclude
listExclude the devices specified by a comma-separated list of major device numbers. Note that RAM disks (major=1) are excluded by default.
−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,
−−ascii
Use ASCII characters for tree formatting.
−m,
−−perms
Output info about device owner, group and mode. This option is equivalent to "-o NAME,SIZE,OWNER,GROUP,MODE".
−l,
−−list
Use the list output format.
−n,
−−noheadings
Do not print a header line.
−o,
−−output
listSpecify which output columns to print. Use
−−help
to get a
list of all supported columns.
−P,
−−pairs
Use key="value" output format.
−r,
−−raw
Use the raw output format.
−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".
For the partitions are some information (e.g. queue attributes) inherited from parental device.
The lsblk
needs to be able to lookup sysfs path by major:minor, which
is done done by using /sys/dev/block
. The block sysfs appeared in
kernel 2.6.27 (October 2008). In case of problem with new
enough kernel check that CONFIG_SYSFS was enabled at the time
of kernel build.