mirror of https://github.com/vitalif/e2fsprogs
143 lines
3.5 KiB
Groff
143 lines
3.5 KiB
Groff
.\" Copyright 2000 Andreas Dilger (adilger@turbolinux.com)
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.\"
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.\" This man page was created for blkid from e2fsprogs-1.25.
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.\"
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.\" This file may be copied under the terms of the GNU Public License.
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.\"
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.\" Based on uuidgen, Mon Sep 17 10:42:12 2000, Andreas Dilger
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.TH BLKID 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
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.SH NAME
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blkid \- command\-line utility to locate/print block device attributes
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.SH SYNOPSIS
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.B blkid
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]...
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[
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.B \-h
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]
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[
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[
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.B \-c
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.I cachefile
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]
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.B \-s
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.I savecachefile
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]
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[
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.B \-p
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]
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[
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.B \-t
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.I token
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]...
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[
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.B \-v
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]
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[
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.I device ...
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]
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.SH DESCRIPTION
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The
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.B blkid
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program is the command-line interface to working with
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.BR libuuid (3)
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library. It can determine the type of content (e.g. filesystem, swap)
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a block device holds, and also attributes (tokens, NAME=value pairs)
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from the content metadata (e.g. LABEL or UUID fields).
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.PP
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.B blkid
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has two main forms of operation: either searching for a device with a
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specific NAME=value pair, or displaying NAME=value pairs for one or
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more devices.
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.SH OPTIONS
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.TP
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.B \-c
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.I <cachefile>
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Read from
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.I cachefile
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instead of reading from the default cache file
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.IR /etc/blkid.tab .
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If you want to start with a clean cache (i.e. don't report devices previously
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scanned but not necessarily available at this time), specify
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.IR /dev/null.
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.TP
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.B \-h
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Display a usage message and exit.
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.TP
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.B \-p
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Probe all available devices. This is the default when displaying
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tokens. When searching for a token normally the cache file is
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used to locate the device and only that device is probed (to ensure
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cache coherency) and all devices are probed only if the token cannot
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be found in the cache.
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.TP
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.B \-s
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.I tag
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.I tag
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is of the form
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.I NAME
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and the resulting token is shown for each (specified) device that has
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such a tag. It is possible to specify multiple
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.I tag
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options. If no tag is specified, then all tokens are shown for all
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(specified) devices.
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In order to just refresh the cache without showing any tokens use
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.B "-s none"
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with no other options.
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.TP
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.B \-t
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.I token
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.I token
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is of the form
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.IB NAME = value
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and that specific token is searched for in the cache or among all visible
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block devices and additionally any specified devices. If that token is
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not found, no output is shown. Common values for
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.I NAME
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include
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.BR TYPE ,
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.BR LABEL ,
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and
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.BR UUID .
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.TP
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.B \-v
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Display version number and exit.
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.SH RETURN VALUE
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The UUID of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb (in
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.BR printf (3)
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format "%08x-%04x-%04x-%04x-%012x") is output to the standard output.
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.TP
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.B \-w
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.I <writecachefile>
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Write the device cache to
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.I writecachefile
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instead of writing it to the default cache file
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.IR /etc/blkid.tab .
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If you don't want to save the cache to the default file, specify
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.IR /dev/null.
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If not specified it will be the same file as that given by the
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.B -c
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option.
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.TP
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.I <device>
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Display tokens from only the specified device. It is possible to
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give multiple
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.I <device>
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options on the command line. If none is given, all devices which
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appear in
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.I /proc/partitions
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are shown, if they are recognized.
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.SH "RETURN CODE"
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If the specified token was found, or if any tags were shown from (specified)
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devices 0 is returned. If the specified token was not found, or no
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(specified) devices could be identified return 2. For usage or other errors
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return 4.
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.SH AUTHOR
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.B blkid
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was written by Andreas Dilger for libblkid.
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.SH AVAILABILITY
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.B blkid
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is part the e2fsprogs package since version 1.26 and is available from
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http://e2fsprogs.sourceforge.net.
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.SH "SEE ALSO"
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.BR libblkid (3)
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