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
38 program is the command-line interface to working with
40 library. It can determine the type of content (e.g. filesystem, swap)
41 a block device holds, and also attributes (tokens, NAME=value pairs)
42 from the content metadata (e.g. LABEL or UUID fields).
45 has two main forms of operation: either searching for a device with a
46 specific NAME=value pair, or displaying NAME=value pairs for one or
53 instead of reading from the default cache file
55 If you want to start with a clean cache (i.e. don't report devices previously
56 scanned but not necessarily available at this time), specify
60 Display a usage message and exit.
63 Probe all available devices. This is the default when displaying
64 tokens. When searching for a token normally the cache file is
65 used to locate the device and only that device is probed (to ensure
66 cache coherency) and all devices are probed only if the token cannot
67 be found in the cache.
70 Show only the tags for each (specified) device that match
72 It is possible to specify multiple
74 options. If no tag is specified, then all tokens are shown for all
76 In order to just refresh the cache without showing any tokens use
78 with no other options.
81 Search the blkid cache (plus any devices specifed on the command line)
82 for all visible block devices with tokens named
86 and print the name of any devices that are found.
96 Display version number and exit.
100 Write the device cache to
102 instead of writing it to the default cache file
104 If you don't want to save the cache to the default file, specify
106 If not specified it will be the same file as that given by the
111 Display tokens from only the specified device. It is possible to
114 options on the command line. If none is given, all devices which
117 are shown, if they are recognized.
119 If the specified token was found, or if any tags were shown from (specified)
120 devices 0 is returned. If the specified token was not found, or no
121 (specified) devices could be identified, an exit code of 2 is returned.
122 For usage or other errors, an exit code of 4 is returned.
125 was written by Andreas Dilger for libblkid.
128 is part the e2fsprogs package since version 1.26 and is available from
129 http://e2fsprogs.sourceforge.net.