1 .\" Copyright 2000 Andreas Dilger (adilger@turbolinux.com)
3 .\" This man page was created for blkid from e2fsprogs-1.25.
5 .\" This file may be copied under the terms of the GNU Public License.
7 .\" Based on uuidgen, Mon Sep 17 10:42:12 2000, Andreas Dilger
8 .TH BLKID 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
10 blkid \- command\-line utility to locate/print block device attributes
42 program is the command-line interface to working with
44 library. It can determine the type of content (e.g. filesystem, swap)
45 a block device holds, and also attributes (tokens, NAME=value pairs)
46 from the content metadata (e.g. LABEL or UUID fields).
49 has two main forms of operation: either searching for a device with a
50 specific NAME=value pair, or displaying NAME=value pairs for one or
57 instead of reading from the default cache file
59 If you want to start with a clean cache (i.e. don't report devices previously
60 scanned but not necessarily available at this time), specify
64 Perform a garbage collection pass on the blkid cache.
67 Display a usage message and exit.
70 Look up one device that matches the search parameter specified using
73 option. If there are multiple devices that match the specified search
74 parameter, then the device with the highest priority is returned, and/or
75 the first device found at a given priority. Device types in order of
76 decreasing priority are Device Mapper, EVMS, LVM, MD, and finally regular
77 block devices. If this option is not specified,
79 will print all of the devices that match the search parameter.
84 output using the specified format. The
90 (only print the value of any tags printed by
94 (only print the device name).
97 Show only the tags for each (specified) device that match
99 It is possible to specify multiple
101 options. If no tag is specified, then all tokens are shown for all
103 In order to just refresh the cache without showing any tokens use
105 with no other options.
108 Search for block devices with tokens named
112 and display any devices which are found.
120 If there are no devices specified on the command line, all block devices
121 will be searched; otherwise, only search the devices specified by the user.
124 Display version number and exit.
128 Write the device cache to
130 instead of writing it to the default cache file
132 If you don't want to save the cache to the default file, specify
134 If not specified it will be the same file as that given by the
139 Display tokens from only the specified device. It is possible to
142 options on the command line. If none is given, all devices which
145 are shown, if they are recognized.
147 If the specified token was found, or if any tags were shown from (specified)
148 devices 0 is returned. If the specified token was not found, or no
149 (specified) devices could be identified, an exit code of 2 is returned.
150 For usage or other errors, an exit code of 4 is returned.
153 was written by Andreas Dilger for libblkid.
156 is part the e2fsprogs package since version 1.26 and is available from
157 http://e2fsprogs.sourceforge.net.