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 Display a usage message and exit.
69 output using the specified format. The
75 (only print the value of any tags printed by
79 (only print the device name).
82 Probe all available devices. This is the default when displaying
83 tokens. When searching for a token normally the cache file is
84 used to locate the device and only that device is probed (to ensure
85 cache coherency) and all devices are probed only if the token cannot
86 be found in the cache.
89 Show only the tags for each (specified) device that match
91 It is possible to specify multiple
93 options. If no tag is specified, then all tokens are shown for all
95 In order to just refresh the cache without showing any tokens use
97 with no other options.
100 Search the blkid cache (plus any devices specifed on the command line)
101 for all visible block devices with tokens named
105 and print the name of any devices that are found.
115 Display version number and exit.
119 Write the device cache to
121 instead of writing it to the default cache file
123 If you don't want to save the cache to the default file, specify
125 If not specified it will be the same file as that given by the
130 Display tokens from only the specified device. It is possible to
133 options on the command line. If none is given, all devices which
136 are shown, if they are recognized.
138 If the specified token was found, or if any tags were shown from (specified)
139 devices 0 is returned. If the specified token was not found, or no
140 (specified) devices could be identified, an exit code of 2 is returned.
141 For usage or other errors, an exit code of 4 is returned.
144 was written by Andreas Dilger for libblkid.
147 is part the e2fsprogs package since version 1.26 and is available from
148 http://e2fsprogs.sourceforge.net.