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.\" -*- nroff -*-
.TH LSBLK 8 "April 2010" "util-linux" "System Administration"
.SH NAME
lsblk \- list block devices
.SH SYNOPSIS
.B lsblk
.RB [ options ]
.sp
.B lsblk
.RB [ options ]
.IR device...
.SH DESCRIPTION
.B lsblk
lists information about all or the specified block devices. The
.B lsblk
command reads the
.I sysfs
filesystem to gather information.
.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 default output from options like --topology and
--fs is subject to change, so whenever possible you should avoid using default
outputs in your scripts. Always explicitly define expected columns by
.B \-\-output
.IR columns
in environment where a stable output is required.
.SH OPTIONS
.IP "\fB\-a, \-\-all\fP"
.B lsblk
does not list empty devices by default. This option disables this restriction.
.IP "\fB\-b, \-\-bytes\fP"
Print the SIZE column in bytes rather than in human-readable format.
.IP "\fB\-d, \-\-nodeps\fP"
Don't print device holders or slaves. For example "lsblk --nodeps /dev/sda" prints
information about the sda device only.
.IP "\fB\-D, \-\-discard\fP"
Print information about the discard (TRIM, UNMAP) capabilities for each device.
.IP "\fB\-e, \-\-exclude \fIlist\fP
Exclude the devices specified by a comma-separated \fIlist\fR of major device numbers.
Note that RAM disks (major=1) are excluded by default. The filter is applied to the top-level
devices only.
.IP "\fB\-I, \-\-include \fIlist\fP
Include devices specified by a comma-separated \fIlist\fR of major device numbers only.
The filter is applied to the top-level devices.
.IP "\fB\-f, \-\-fs\fP
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
.BR blkid (8)
command.
.IP "\fB\-h, \-\-help\fP"
Print a help text and exit.
.IP "\fB\-i, \-\-ascii\fP"
Use ASCII characters for tree formatting.
.IP "\fB\-m, \-\-perms\fP
Output info about device owner, group and mode. This option is equivalent to "-o NAME,SIZE,OWNER,GROUP,MODE".
.IP "\fB\-l, \-\-list\fP"
Use the list output format.
.IP "\fB\-n, \-\-noheadings\fP"
Do not print a header line.
.IP "\fB\-o, \-\-output \fIlist\fP"
Specify which output columns to print. Use
.B "--help"
to get a list of all supported columns.
.IP "\fB\-P, \-\-pairs\fP"
Use key="value" output format. All potentially unsafe characters are hex-escaped (\\x<code>).
.IP "\fB\-r, \-\-raw\fP"
Use the raw output format. All potentially unsafe characters are hex-escaped
(\\x<code>) in NAME, KNAME, LABEL, PARTLABEL and MOUNTPOINT columns.
.IP "\fB\-s, \-\-inverse\fP"
Print dependencies in inverse order.
.IP "\fB\-t, \-\-topology\fP"
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".
.IP "\fB\-V, \-\-version\fP"
Output version information and exit.
.SH NOTES
For partitions, some information (e.g. queue attributes) is inherited from the
parent device.
.PP
The
.B lsblk
needs to be able to lookup sysfs path by major:minor, which is done
done by using
.BR /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.
.SH AUTHORS
.nf
Milan Broz <mbroz@redhat.com>
Karel Zak <kzak@redhat.com>
.fi
.SH SEE ALSO
.BR findmnt (8),
.BR blkid (8),
.BR ls (1)
.SH AVAILABILITY
The lsblk command is part of the util-linux package and is available from
ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
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