-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.

-d     Don't encode non-printing characters. The non-printing characters are encoded by ^ and M- notation
       by  default.  Note that -o udev output format uses a diffrent encoding and this encoding cannot be
       disabled.

-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 can be used together with the -p option.

-l     Look up only one device that matches the search parameter specified with -t.

-k     List all known filesystems and RAIDs and exit.

-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.

-L label
       Look  up  the  device that uses this label (equal to: -l -o device -t LABEL=<label>).  This lookup
       method is able to reliably use  /dev/disk/by-label  udev  symlinks  (dependent  on  a  setting  in
       /etc/blkid.conf).   Avoid  using  the  symlinks  directly;  it is not reliable to use the symlinks
       without verification.  The -L option works on systems with and without udev.

       Unfortunately, the original blkid(8) from e2fsprogs use the -L option as a synonym for the -o list
       option.   For  better  portability,  use -l -o device -t LABEL=<label> and -o list in your scripts
       rather than the -L option.

-n list
       Restrict the probing functions  to  the  specified  (comma-separated)  list  of  superblock  types
       (names).   The  list items may be prefixed with "no" to specify the types which should be ignored.
       For example:

         blkid -p -n vfat,ext3,ext4 /dev/sda1

       probes for vfat, ext3 and ext4 filesystems, and

         blkid -p -n nominix /dev/sda1

       probes for all supported formats except minix filesystems.  This option is  only  useful  together
       with -p.

-o format
       Display blkid's output using the specified format.  The format parameter may be:

-O offset
       Probe  at  the  given  offset (only useful with -p).  This option can be used together with the -i
       option.

-p     Switch to low-level superblock probing mode (bypass cache).

       Note that low-level probing also returns information about partition table type (PTTYPE  tag)  and
       partitions (PART_ENTRY_* tags).

-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.

-S size
       Overwrite device/file size (only useful with -p).

-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.

-u list
       Restrict  the  probing  functions  to  the  specified  (comma-separated)  list  of  "usage" types.
       Supported usage types are: filesystem, raid, crypto and other.  The list  items  may  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 filesystem and other (e.g. swap) formats, and

         blkid -p -u noraid /dev/sda1

       probes for all supported formats except RAIDs.  This option is only useful together with -p.

-U uuid
       Look up the device that uses this uuid.  For more details see the -L option.

-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 at all, specify /dev/null.  If not specified,
       it will be the same file as that given with the -c option.