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blkid(8) - blkid - command-line utility to locate/print block device attributes - man 8 blkid

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BLKID(8)                                                              BLKID(8)



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

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

DESCRIPTION
       The blkid program is the command-line interface to working  with  libu-
       uid(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 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 devices.

OPTIONS
       -c     <cachefile>  Read  from  cachefile  instead  of reading from the
              default cache file(1,n) /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(1,2,n)), specify /dev/null.

       -h     Display a usage message and exit.

       -p     Probe all available devices.  This is the default when  display-
              ing  tokens.  When searching for a token normally the cache file(1,n)
              is used to locate the device and only that device is probed  (to
              ensure  cache  coherency) and all devices are probed only if(3,n) the
              token cannot be found in(1,8) 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 specific token is
              searched for in(1,8) 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(1,3,5) number and exit.

RETURN VALUE
       The UUID of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb (in(1,8) printf(1,3,1 builtins)(3)
       format "%08x-%04x-%04x-%04x-%012x") is output to the standard output.

       -w     <writecachefile>  Write  the  device  cache  to   writecachefile
              instead  of writing it to the default cache file(1,n) /etc/blkid.tab.
              If you don't want to save the cache to the default file(1,n), specify
              /dev/null.   If  not  specified it will be the same file(1,n) 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 command line.  If none
              is given, all  devices  which  appear  in(1,8)  /proc(5,n)/partitions  are
              shown, if(3,n) they are recognized.

RETURN CODE
       If the specified token was found, or if(3,n) any tags were shown from (spec-
       ified) 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.

AUTHOR
       blkid was written by Andreas Dilger for libblkid.

AVAILABILITY
       blkid is part the e2fsprogs package since version(1,3,5) 1.26 and is available
       from http://e2fsprogs.sourceforge.net.

SEE ALSO
       libblkid(3)



E2fsprogs version(1,3,5) 1.35           February 2004                        BLKID(8)

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