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    Command:

    blkid

    
    
    

    SYNOPSIS

           blkid -L label | -U uuid
    
           blkid [-ghlv] [-c file] [-w file] [-o format]
                 [-s tag] [-t NAME=value] device [device ...]
    
           blkid -p [-O offset] [-S size] [-o format] [-s tag]
                    [-u list] device [device ...]
    
           blkid -i [-o format] [-s tag] device [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).
    
           Note  that  blkid  reads information directly from devices and for non-
           root users it returns cached unverified information.  It is  better  to
           use  lsblk  --fs  to  get  a  user-friendly overview of filesystems and
           devices.  lsblk(8) is also easy to use in  scripts.   blkid  is  mostly
           designed for system services and to test libblkid functionality.
    
           blkid does not read information about removable devices by default.
    
           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/blkid.tab.  If you want to start  with  a  clean
                  cache (i.e. don't report devices previously scanned but not nec-
                  essarily 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.
    
           -i     Display  I/O Limits (aka I/O topology) information. The 'export'
                  output format is automatically enabled.  This  option  could  be
                  used together with -p option.
    
           -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
                  ity  use  "-l  -o device -t LABEL=<label>" and "-o list" in your
                  scripts rather than -L option.
    
           -u  list
                  Restrict probing functions to defined (comma separated) list  of
                  "usage"  types.   Supported  usage  types are: filesystem, raid,
                  crypto and other. The list can be prefixed with "no" to  specify
                  the usage types which should be ignored. For example:
    
                    blkid -p -u filesystem,other /dev/sda1
    
                  probes for all filesystems and others (e.g. swap) formats, and
    
                    blkid -p -u noraid /dev/sda1
    
                  probes  for  all supported formats exclude RAIDs. This option is
                  useful with -p only.
    
           -U  uuid
                  Look up one device that uses the uuid. For more details see  the
                  -L option.
    
           -o format
                  Display  blkid's  output using the specified format.  The format
                  parameter may be:
    
                  full   print all tags (the default)
    
                  value  print the value of the tags
    
                  list   print the devices in a user-friendly format, this  output
                         format is unsupported for low-level probing (-p or -i)
    
                  device print  the device name only, this output format is always
                         enabled for -L and -U options
    
                  udev   print key="value" pairs for easy  import  into  the  udev
                         environment
    
                  export print  key=value  pairs for easy import into the environ-
                         ment.  This output format is automatically  enabled  when
                         I/O Limits (-i option) are requested.
    
           -O bytes
                  Probe  at  the  given  offset (only useful with -p). This option
                  could be used together with -i option.
    
           -p     Switch to low-level superblock probing mode (bypass cache).
    
           -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)
    
           -w writecachefile
                  Write the device cache to writecachefile instead of  writing  it
                  to the default cache file.
    
                  This  functionality has never been implemented and the option is
                  no more supported on the recent blkid versions (>= v2.21).
    
           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  and  improved  by
           Theodore Ts'o and Karel Zak.
    
    
    

    AVAILABILITY

           The blkid command is part of the util-linux-ng package and is available
           from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
    
    

    SEE ALSO

           libblkid(3) findfs(8) wipefs(8)
    
    
    

    Linux February 2009 BLKID(8)

    
    
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