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
41 program is the command-line interface to working with
43 library. It can determine the type of content (e.g. filesystem, swap)
44 a block device holds, and also attributes (tokens, NAME=value pairs)
45 from the content metadata (e.g. LABEL or UUID fields).
48 has two main forms of operation: either searching for a device with a
49 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.
67 Probe all available devices. This is the default when displaying
68 tokens. When searching for a token normally the cache file is
69 used to locate the device and only that device is probed (to ensure
70 cache coherency) and all devices are probed only if the token cannot
71 be found in the cache.
78 and the resulting token is shown for each (specified) device that has
79 such a tag. It is possible to specify multiple
81 options. If no tag is specified, then all tokens are shown for all
83 In order to just refresh the cache without showing any tokens use
85 with no other options.
92 and that specific token is searched for in the cache or among all visible
93 block devices and additionally any specified devices. If that token is
94 not found, no output is shown. Common values for
103 Display version number and exit.
105 The UUID of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb (in
107 format "%08x-%04x-%04x-%04x-%012x") is output to the standard output.
111 Write the device cache to
113 instead of writing it to the default cache file
115 If you don't want to save the cache to the default file, specify
117 If not specified it will be the same file as that given by the
122 Display tokens from only the specified device. It is possible to
125 options on the command line. If none is given, all devices which
128 are shown, if they are recognized.
130 If the specified token was found, or if any tags were shown from (specified)
131 devices 0 is returned. If the specified token was not found, or no
132 (specified) devices could be identified return 2. For usage or other errors
136 was written by Andreas Dilger for libblkid.
139 is part the e2fsprogs package since version 1.26 and is available from
140 http://e2fsprogs.sourceforge.net.