BLKID(8) System Administration BLKID(8)
blkid - locate/print block device attributes
blkid -L label | -U uuid
blkid [-dghlv] [-c file] [-w file] [-o format]
[-s tag] [-t NAME=value] [device ...]
blkid -p [-O offset] [-S size] [-o format] [-s tag]
[-n list] [-u list] device ...
blkid -i [-o format] [-s tag] device ...
The blkid program is the command-line interface to working with the
libblkid(3) library. It can determine the type of content (e.g.
filesystem or swap) that a block device holds, and also attributes
(tokens, NAME=value pairs) from the content metadata (e.g. LABEL or
blkid has two main forms of operation: either searching for a device
with a specific NAME=value pair, or displaying NAME=value pairs for one
or more specified devices.
The size and offset arguments may be followed by binary (2^N) suffixes
KiB, MiB, GiB, TiB, PiB and EiB (the "iB" is optional, e.g. "K" has the
same meaning as "KiB") or decimal (10^N) suffixes KB, MB, GB, PB and
Read from cachefile instead of reading from the default cache
file /etc/blkid.tab. If you want to start with a clean cache
(i.e. don't report devices previously scanned but not necessar-
ily available at this time), specify /dev/null.
-d Don't encode non-printing characters. The non-printing charac-
ters are encoded by ^ and M- notation by default. Note that -o
udev output format uses a diffrent encoding and this encoding
cannot be disabled.
-g Perform a garbage collection pass on the blkid cache to remove
devices which no longer exist.
-h Display a usage message and exit.
-i Display I/O Limits (aka I/O topology) information. The 'export'
output format is automatically enabled. This option can be used
together with the -p option.
-l Look up only one device that matches the search parameter speci-
fied with -t.
-k List all known filesystems and RAIDs and exit.
-t option. If there are multiple devices that match the specified
search parameter, then the device with the highest priority is
returned, and/or the first device found at a given priority.
Device types in order of decreasing priority are Device Mapper,
EVMS, LVM, MD, and finally regular block devices. If this
option is not specified, blkid will print all of the devices
that match the search parameter.
Look up the device that uses this label (equal to: -l -o device