Manual Reference Pages - BLKID (8)
blkid - command-line utility to locate/print block device attributes
device ... ]
blkid program is the command-line interface to working with
library. It can determine the type of content (e.g. filesystem, swap)
a block device holds, and also attributes (tokens, NAME=value pairs)
from the content metadata (e.g. LABEL or UUID fields).
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
-c cachefile |
cachefile instead of reading from the default cache file
/etc/blkid.tab. If you want to start with a clean cache (i.e. dont report devices previously
scanned but not necessarily available at this time), specify
Perform a garbage collection pass on the blkid cache to remove
devices which no longer exist.
Display a usage message and exit.
Look up one device that matches the search parameter specified using
-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.
-o format |
blkids output using the specified format. The
format parameter may be
full (the default),
value (only print the value of the tags),
list (print the devices in a user-friendly format),
device (only print the device name).
Print the devices in a user-friendly list format. This is the
equivalent of using the option -o list.
-s tag ||
For each (specified) device, show only the tags that match
tag. It is possible to specify multiple
-s options. If no tag is specified, then all tokens are shown for all
In order to just refresh the cache without showing any tokens, use
-s none with no other options.
-t NAME=value |
Search for block devices with tokens named
NAME that have the value
value, and display any devices which are found.
Common values for
UUID. If there are no devices specified on the command line, all block devices
will be searched; otherwise only the specified devices are searched.
Display version number and exit.
-w writecachefile |
Write the device cache to
writecachefile instead of writing it to the default cache file
/etc/blkid.tab. If you dont want to save the cache to the default file, specify
/dev/null. If not specified it will be the same file as that given by the
Display tokens from only the specified device. It is possible to
device options on the command line. If none is given, all devices which
/proc/partitions are shown, if they are recognized.
If the specified token was found, or if any tags were shown from (specified)
devices, 0 is returned. If the specified token was not found, or no
(specified) devices could be identified, an exit code of 2 is returned.
For usage or other errors, an exit code of 4 is returned.
blkid was written by Andreas Dilger for libblkid.
blkid is part the e2fsprogs package since version 1.26 and is available from
|E2fsprogs version 1.42.13 ||BLKID (8) ||May 2015 |
Visit the GSP FreeBSD Man Page Interface.
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