1LSBLK(8) System Administration LSBLK(8)
2
6 lsblk - list block devices
7
9 lsblk [options] [device...]
10
12 lsblk lists information about all available or the specified block
13 devices. The lsblk command reads the sysfs filesystem and udev db to
14 gather information. If the udev db is not available or lsblk is com‐
15 piled without udev support than it tries to read LABELs, UUIDs and
16 filesystem types from the block device. In this case root permissions
17 are necessary.
18 The command prints all block devices (except RAM disks) in a tree-like
20 format by default. Use lsblk --help to get a list of all available
21 columns.
22 The default output, as well as the default output from options like
24 --fs and --topology, is subject to change. So whenever possible, you
25 should avoid using default outputs in your scripts. Always explicitly
26 define expected columns by using --output columns-list in environments
27 where a stable output is required.
28 Note that lsblk might be executed in time when udev does not have all
30 information about recently added or modified devices yet. In this case
31 it is recommended to use udevadm settle before lsblk to synchronize
32 with udev.
33
35 -a, --all
36 Also list empty devices and RAM disk devices.
37 -b, --bytes
39 Print the SIZE column in bytes rather than in a human-readable
40 format.
41 -D, --discard
43 Print information about the discarding capabilities (TRIM,
44 UNMAP) for each device.
45 -z, --zoned
47 Print the zone model for each device.
48 -d, --nodeps
50 Do not print holder devices or slaves. For example, lsblk
51 --nodeps /dev/sda prints information about the sda device only.
52 -e, --exclude list
54 Exclude the devices specified by the comma-separated list of
55 major device numbers. Note that RAM disks (major=1) are
56 excluded by default if --all is no specified. The filter is
57 applied to the top-level devices only. This maybe be confusing
58 for --list output format where hierarchy of the devices is not
59 obvious.
60 -f, --fs
62 Output info about filesystems. This option is equivalent to
63 -o NAME,FSTYPE,LABEL,UUID,MOUNTPOINT. The authoritative infor‐
64 mation about filesystems and raids is provided by the blkid(8)
65 command.
66 -h, --help
68 Display help text and exit.
69 -I, --include list
71 Include devices specified by the comma-separated list of major
72 device numbers. The filter is applied to the top-level devices
73 only. This maybe be confusing for --list output format where
74 hierarchy of the devices is not obvious.
75 -i, --ascii
77 Use ASCII characters for tree formatting.
78 -J, --json
80 Use JSON output format.
81 -l, --list
83 Produce output in the form of a list.
84 -m, --perms
86 Output info about device owner, group and mode. This option is
87 equivalent to -o NAME,SIZE,OWNER,GROUP,MODE.
88 -n, --noheadings
90 Do not print a header line.
91 -o, --output list
93 Specify which output columns to print. Use --help to get a list
94 of all supported columns.
95 The default list of columns may be extended if list is specified
97 in the format +list (e.g. lsblk -o +UUID).
98 -O, --output-all
100 Output all available columns.
101 -P, --pairs
103 Produce output in the form of key="value" pairs. All poten‐
104 tially unsafe characters are hex-escaped (\x<code>).
105 -p, --paths
107 Print full device paths.
108 -r, --raw
110 Produce output in raw format. All potentially unsafe characters
111 are hex-escaped (\x<code>) in the NAME, KNAME, LABEL, PARTLABEL
112 and MOUNTPOINT columns.
113 -S, --scsi
115 Output info about SCSI devices only. All partitions, slaves and
116 holder devices are ignored.
117 -s, --inverse
119 Print dependencies in inverse order. If the --list output is
120 requested then the lines are still ordered by dependencies.
121 -t, --topology
123 Output info about block-device topology. This option is equiva‐
124 lent to -o NAME,ALIGNMENT,MIN-IO,OPT-IO,PHY-SEC,LOG-
125 SEC,ROTA,SCHED,RQ-SIZE,RA,WSAME.
126 -V, --version
128 Display version information and exit.
129 -x, --sort column
131 Sort output lines by column. This option enables --list output
132 format by default. It is possible to use the option --tree to
133 force tree-like output and than the tree branches are sorted by
134 the column.
135 --sysroot directory
137 Gather data for a Linux instance other than the instance from
138 which the lsblk command is issued. The specified directory is
139 the system root of the Linux instance to be inspected. This
140 option is designed for the testing purpose.
141
144 For partitions, some information (e.g. queue attributes) is inherited
145 from the parent device.
146 The lsblk command needs to be able to look up each block device by
148 major:minor numbers, which is done by using /sys/dev/block. This sysfs
149 block directory appeared in kernel 2.6.27 (October 2008). In case of
150 problems with a new enough kernel, check that CONFIG_SYSFS was enabled
151 at the time of the kernel build.
152
155 0 success
156 1 failure
158 32 none of specified devices found
160 64 some specified devices found, some not found
162
165 Milan Broz <mbroz@redhat.com>
166 Karel Zak <kzak@redhat.com>
167
169 LSBLK_DEBUG=all
170 enables lsblk debug output.
171 LIBBLKID_DEBUG=all
173 enables libblkid debug output.
174 LIBMOUNT_DEBUG=all
176 enables libmount debug output.
177 LIBSMARTCOLS_DEBUG=all
179 enables libsmartcols debug output.
180 LIBSMARTCOLS_DEBUG_PADDING=on
182 use visible padding characters. Requires enabled LIBSMART‐
183 COLS_DEBUG.
184
186 ls(1), blkid(8), findmnt(8)
187
189 The lsblk command is part of the util-linux package and is available
190 from https://www.kernel.org/pub/linux/utils/util-linux/.
191util-linux February 2013 LSBLK(8)