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       blkid ]...  [ -h ] [ [ -c cachefile ] -s savecachefile ] [
       -p ] [ -t token ]...  [ -v ] [ device ...  ]


       The blkid program is the command-line interface to working
       with libuuid(3) 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  con­
       tent 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  display­
       ing NAME=value pairs for one or more devices.


       -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  necessarily
              available at this time), specify /dev/null.

       -h     Display a usage message and exit.

       -p     Probe  all  available devices.  This is the default
              when displaying tokens.  When searching for a token
              normally  the  cache  file  is  used  to locate the
              device and only that device is  probed  (to  ensure
              cache coherency) and all devices are probed only if
              the token cannot be found in the cache.

       -s     tag tag is of the form NAME and the resulting token
              is  shown for each (specified) device that has such
              a tag.  It is  possible  to  specify  multiple  tag
              options.   If  no tag is specified, then all tokens
              are shown for all (specified) devices.  In order to
              just  refresh  the cache without showing any tokens
              use -s none with no other options.

       -t     token token is of the form NAME=value and that spe­
              cific  token  is searched for in the cache or among
              all visible  block  devices  and  additionally  any
              specified  devices.  If that token is not found, no
              output is shown.  Common values  for  NAME  include
              TYPE, LABEL, and UUID.

       -v     Display version number and exit.


       The  UUID of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb
       (in printf(3) format "%08x-%04x-%04x-%04x-%012x") is  out­
              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 return 2.  For usage or other errors
       return 4.


       blkid was written by Andreas Dilger for libblkid.


       blkid is part the e2fsprogs package since version 1.26 and
       is available from http://e2fsprogs.sourceforge.net.



E2fsprogs version 1.34      July 2003                    BLKID(8)
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