216 lines
7.2 KiB
Groff
216 lines
7.2 KiB
Groff
.TH LSBLK 8 "February 2013" "util-linux" "System Administration"
|
|
.SH NAME
|
|
lsblk \- list block devices
|
|
.SH SYNOPSIS
|
|
.B lsblk
|
|
[options]
|
|
.RI [ device ...]
|
|
.SH DESCRIPTION
|
|
.B lsblk
|
|
lists information about all available or the specified block devices. The
|
|
.B lsblk
|
|
command reads the
|
|
.B sysfs
|
|
filesystem and
|
|
.B 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.
|
|
.PP
|
|
The command prints all block devices (except RAM disks) in a tree-like format
|
|
by default. Use
|
|
.B "lsblk \-\-help"
|
|
to get a list of all available columns.
|
|
.PP
|
|
The default output, as well as the default output from options like
|
|
.B \-\-fs
|
|
and
|
|
.BR \-\-topology ,
|
|
is subject to change. So whenever possible, you should avoid using default
|
|
outputs in your scripts. Always explicitly define expected columns by using
|
|
.B \-\-output
|
|
.I columns-list
|
|
and
|
|
.B \-\-list
|
|
in environments where a stable output is required.
|
|
.PP
|
|
Note that
|
|
.B lsblk
|
|
might be executed in time when
|
|
.B udev
|
|
does not have all information about recently added or modified devices yet. In this
|
|
case it is recommended to use
|
|
.B "udevadm settle"
|
|
before lsblk to synchronize with udev.
|
|
.SH OPTIONS
|
|
.TP
|
|
.BR \-a , " \-\-all"
|
|
Also list empty devices and RAM disk devices.
|
|
.TP
|
|
.BR \-b , " \-\-bytes"
|
|
Print the SIZE column in bytes rather than in a human-readable format.
|
|
.TP
|
|
.BR \-D , " \-\-discard"
|
|
Print information about the discarding capabilities (TRIM, UNMAP) for each device.
|
|
.TP
|
|
.BR \-d , " \-\-nodeps"
|
|
Do not print holder devices or slaves. For example, \fBlsblk \-\-nodeps /dev/sda\fR prints
|
|
information about the sda device only.
|
|
.TP
|
|
.BR \-E , " \-\-dedup " \fIcolumn\fP
|
|
Use \fIcolumn\fP 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 \fB\-E WWN\fR.
|
|
.TP
|
|
.BR \-e , " \-\-exclude " \fIlist\fP
|
|
Exclude the devices specified by the comma-separated \fIlist\fR of major device numbers.
|
|
Note that RAM disks (major=1) are excluded by default if \fB\-\-all\fR is not specified.
|
|
The filter is applied to the top-level devices only. This may be confusing for
|
|
\fB\-\-list\fR output format where hierarchy of the devices is not obvious.
|
|
.TP
|
|
.BR \-f , " \-\-fs"
|
|
Output info about filesystems. This option is equivalent to
|
|
.BR \-o\ NAME,FSTYPE,LABEL,UUID,FSAVAIL,FSUSE%,MOUNTPOINT .
|
|
The authoritative information about filesystems and raids is provided by the
|
|
.BR blkid (8)
|
|
command.
|
|
.TP
|
|
.BR \-h , " \-\-help"
|
|
Display help text and exit.
|
|
.TP
|
|
.BR \-I , " \-\-include " \fIlist\fP
|
|
Include devices specified by the comma-separated \fIlist\fR of major device numbers.
|
|
The filter is applied to the top-level devices only. This may be confusing for
|
|
\fB\-\-list\fR output format where hierarchy of the devices is not obvious.
|
|
.TP
|
|
.BR \-i , " \-\-ascii"
|
|
Use ASCII characters for tree formatting.
|
|
.TP
|
|
.BR \-J , " \-\-json"
|
|
Use JSON output format. It's strongly recommended to use \fB\-\-output\fR and
|
|
also \fB\-\-tree\fR if necessary.
|
|
.TP
|
|
.BR \-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 if \fB\-\-pairs\fR or \fB\-\-raw\fR not specified (the
|
|
parsable outputs are maintained in backwardly compatible way).
|
|
.TP
|
|
.BR \-M , " \-\-merge"
|
|
Group parents of sub-trees to provide more readable output for RAIDs and
|
|
Multi-path devices. The tree-like output is required.
|
|
.TP
|
|
.BR \-m , " \-\-perms"
|
|
Output info about device owner, group and mode. This option is equivalent to
|
|
.BR \-o\ NAME,SIZE,OWNER,GROUP,MODE .
|
|
.TP
|
|
.BR \-n , " \-\-noheadings"
|
|
Do not print a header line.
|
|
.TP
|
|
.BR \-o , " \-\-output " \fIlist\fP
|
|
Specify which output columns to print. Use
|
|
.B \-\-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 \fB\-\-tree\fR).
|
|
|
|
The default list of columns may be extended if \fIlist\fP is
|
|
specified in the format \fI+list\fP (e.g., \fBlsblk \-o +UUID\fP).
|
|
.TP
|
|
.BR \-O , " \-\-output\-all"
|
|
Output all available columns.
|
|
.TP
|
|
.BR \-P , " \-\-pairs"
|
|
Produce output in the form of key="value" pairs. The output lines are still ordered by
|
|
dependencies. All potentially unsafe characters are hex-escaped (\\x<code>).
|
|
.TP
|
|
.BR \-p , " \-\-paths"
|
|
Print full device paths.
|
|
.TP
|
|
.BR \-r , " \-\-raw"
|
|
Produce output in raw format. The output lines are still ordered by
|
|
dependencies. All potentially unsafe characters are hex-escaped
|
|
(\\x<code>) in the NAME, KNAME, LABEL, PARTLABEL and MOUNTPOINT columns.
|
|
.TP
|
|
.BR \-S , " \-\-scsi"
|
|
Output info about SCSI devices only. All partitions, slaves and holder devices are ignored.
|
|
.TP
|
|
.BR \-s , " \-\-inverse"
|
|
Print dependencies in inverse order. If the \fB\-\-list\fR output is requested then
|
|
the lines are still ordered by dependencies.
|
|
.TP
|
|
.BR \-T , " \-\-tree" [ =\fIcolumn ]
|
|
Force tree-like output format. If \fIcolumn\fP is specified, then a tree is printed in the column.
|
|
The default is NAME column.
|
|
.TP
|
|
.BR \-t , " \-\-topology"
|
|
Output info about block-device topology.
|
|
This option is equivalent to
|
|
.BR \-o\ NAME,ALIGNMENT,MIN-IO,OPT-IO,PHY-SEC,LOG-SEC,ROTA,SCHED,RQ-SIZE,RA,WSAME .
|
|
.TP
|
|
.BR \-V , " \-\-version"
|
|
Display version information and exit.
|
|
.TP
|
|
.BR \-x , " \-\-sort " \fIcolumn\fP
|
|
Sort output lines by \fIcolumn\fP. This option enables \fB\-\-list\fR output format by default.
|
|
It is possible to use the option \fI\-\-tree\fP to force tree-like output and
|
|
than the tree branches are sorted by the \fIcolumn\fP.
|
|
.TP
|
|
.BR \-z , " \-\-zoned"
|
|
Print the zone model for each device.
|
|
.TP
|
|
.BR " \-\-sysroot " \fIdirectory\fP
|
|
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. The real device nodes in the target directory can
|
|
be replaced by text files with udev attributes.
|
|
|
|
.SH EXIT STATUS
|
|
.IP 0
|
|
success
|
|
.IP 1
|
|
failure
|
|
.IP 32
|
|
none of specified devices found
|
|
.IP 64
|
|
some specified devices found, some not found
|
|
|
|
.SH ENVIRONMENT
|
|
.IP LSBLK_DEBUG=all
|
|
enables lsblk debug output.
|
|
.IP LIBBLKID_DEBUG=all
|
|
enables libblkid debug output.
|
|
.IP LIBMOUNT_DEBUG=all
|
|
enables libmount debug output.
|
|
.IP LIBSMARTCOLS_DEBUG=all
|
|
enables libsmartcols debug output.
|
|
.IP LIBSMARTCOLS_DEBUG_PADDING=on
|
|
use visible padding characters. Requires enabled LIBSMARTCOLS_DEBUG.
|
|
.SH NOTES
|
|
For partitions, some information (e.g., queue attributes) is inherited from the
|
|
parent device.
|
|
.PP
|
|
The
|
|
.B lsblk
|
|
command needs to be able to look up each block device by major:minor numbers,
|
|
which is done by using
|
|
.IR /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.
|
|
|
|
.SH AUTHORS
|
|
.nf
|
|
Milan Broz <mbroz@redhat.com>
|
|
Karel Zak <kzak@redhat.com>
|
|
.fi
|
|
.SH SEE ALSO
|
|
.BR ls (1),
|
|
.BR blkid (8),
|
|
.BR findmnt (8)
|
|
.SH AVAILABILITY
|
|
The lsblk command is part of the util-linux package and is available from
|
|
https://www.kernel.org/pub/linux/utils/util-linux/.
|