blkid man page on aLinux

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BLKID(8)							      BLKID(8)

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

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

DESCRIPTION
       The blkid program is the command-line interface to  working  with  lib‐
       blkid(3)	 library.  It can determine the type of content (e.g. filesys‐
       tem,  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  /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.

       -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 one device that matches the search  parameter  specified
	      using  the  -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
	      Display  blkid's	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 for‐
	      mat), or device (only print the device name).

       -L     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  (specified)
	      devices.	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 NAME include TYPE, LABEL, and UUID.  If there are no
	      devices specified on the command line, all block devices will be
	      searched; otherwise only the specified devices are searched.

       -v     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 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 command 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 (spec‐
       ified)  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.

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 1.41.12	   May 2010			      BLKID(8)
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