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BLKID(8)                     System Administration                    BLKID(8)



NAME
       blkid - locate/print block device attributes

SYNOPSIS
       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 ...


DESCRIPTION
       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
       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 more specified devices.

OPTIONS
       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
       EB.

       -c cachefile
              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.

       -L label
              Look up the device that uses this label (equal to: -l -o  device
              -t  LABEL=



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