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blkid.8.gz

BLKID(8)                                                    BLKID(8)



NAME
       blkid  -  command-line  utility  to locate/print block device
       attributes

SYNOPSIS
       blkid [ -ghlv ] [ [ -c cachefile ] -w writecachefile ]  [  -o
       format ] [ -s tag ] [ -t NAME=value ] [ device ...  ]

DESCRIPTION
       The  blkid  program  is the command-line interface to working
       with libuuid(3) library.  It can determine the type  of  con‐
       tent  (e.g.  filesystem, swap) a block device holds, and also
       attributes (tokens, NAME=value pairs) from the content  meta‐
       data (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 devices.

OPTIONS
       -c     Read  from  cachefile  instead  of  reading  from  the
              default cache file /etc/blkid/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.

       -g     Perform  a  garbage collection pass on the blkid cache
              to remove devices which no longer exist.

       -h     Display a usage message and exit.

       -l     Look up the device that matches the  search  parameter
              specified  using the -t option, assuming that there is
              only one matching the search parameter.  For a  system
              with  a large number of disks, this will be more effi‐
              cient by  avoiding  the  need  to  revalidate  devices
              unless  absolutely  necessary.   If this option is not
              specified, blkid will use a less  efficient  approach,
              which  allows  blkid  to print all of the devices that
              match the search parameter.

              This option is best used  for  tag  searches  such  as
              LABEL=data_vol       or       UUID=e280469a-d06f-4c0b-
              b068-44f3b576029e.  If you want blkid to print all  of
              the  ext3 filesystems using a search parameter such as
              TYPE=ext3, then this option should not be used.

       -o     Display blkid's output  using  the  specified  format.
              The  format  parameter  may  be  full,  (the default),
              value, (only print the value of any  tags  printed  by
              blkid) or device (only print the device name).

       -s     Show  only  the  tags for each (specified) device that
              match tag.  It is  possible  to  specify  multiple  -s
              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     Search for block devices with tokens named  NAME  that
              have  the  value  value, and display any devices which
              are found.   Common  values  for  NAME  include  TYPE,
              LABEL, and UUID.  If there are no devices specified on
              the command line, all block devices will be  searched;
              otherwise,  only  search  the devices specified by the
              user.

       -v     Display version number and exit.

       -w     <writecachefile> Write  the  device  cache  to  write‐
              cachefile  instead  of writing it to the default cache
              file /etc/blkid/blkid.tab.  If you don't 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 -c option.

       <device>
              Display  tokens from only the specified device.  It is
              possible to give multiple <device> options on the com‐
              mand line.  If none is given, all devices which appear
              in /proc/partitions are shown, if they are recognized.

RETURN CODE
       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 iden‐
       tified,  an  exit  code of 2 is returned.  For usage or other
       errors, an exit code of 4 is returned.

AUTHOR
       blkid was written by Andreas Dilger for libblkid.

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

SEE ALSO
       libblkid(3)



E2fsprogs version 1.39        May 2006                      BLKID(8)
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