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.TH VOL_ID 8 "November 2005" "" "Linux Administrator's Manual"
.SH NAME
vol_id \- probe filesystem type and read label and uuid
.SH SYNOPSIS
.BI vol_id
[\fI--export\fP|\fI-t\fP|\fI-l\fP|\fI-u\fP] \fIblockdevice\fP
.SH "DESCRIPTION"
.B vol_id
is normally called from a udev rule, to provide udev with the
label and uuid of a filesystem. vol_id supports all common
filesystem formats and detects various raid setups to prevent
the recognition of raid members as a filesystem.
.SH USAGE
.B vol_id
opens the device node specified at the commandline.
.SH OPTIONS
The following commandline switches are supported to specify what vol_id
should print:
.TP
.BI --export
print all values in key/value format to import them into the environment.
.TP
.BI -l
print the label of the partition
.TP
.BI -t
print the type of the partition
.TP
.BI -u
print the uuid of the partition
.RE
.SH EXIT STATUS
.B vol_id
will only return successful if the string asked for is not empty.
All trailing whitespace will be removed, spaces replaced by underscore
and slashes ignored.
.SH SEE ALSO
.BR udev (8)
.SH AUTHORS
Developed by Kay Sievers <kay.sievers@vrfy.org>.
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