blkid: also accept -V for displaying version information

[thirdparty/util-linux.git] / misc-utils / findmnt.8

.\" -*- nroff -*-
.TH FINDMNT 8 "April 2010" "util-linux" "System Administration"
.SH NAME
findmnt \- find a filesystem
.SH SYNOPSIS
.B findmnt
.RB [ options ]
.sp
.B findmnt
.RB [ options ]
.IR device | mountpoint
.sp
.B findmnt
.RB [ options ]
.RB [ \--source ]
.IR device
.RB [ \--target ]
.IR mountpoint
.SH DESCRIPTION
.B findmnt
will list all mounted filesytems or search for a filesystem.  The
.B findmnt
command is able to search in
.IR /etc/fstab ,
.IR /etc/mtab
or
.IR /proc/self/mountinfo .
If
.IR device
or
.IR mountpoint
is not given, all filesystems are shown.
.PP
The device may be specified by device name, maj:min, filesystem LABEL or UUID
or partition PARTUUID or PARTLABEL.  Note that device name may be interpreted
as mountpoint (and vice versa) if --target or --source options are not
specified.
.PP
The command prints all mounted filesystems in the tree-like format by default.
.SH OPTIONS
.IP "\fB\-h, \-\-help\fP"
Print help and exit.
.IP "\fB\-s, \-\-fstab\fP"
Search in
.IR /etc/fstab .
The output is in the list format (see --list).
.IP "\fB\-m, \-\-mtab\fP"
Search in
.IR /etc/mtab .
The output is in the list format (see \fB\-\-list\fP).
.IP "\fB\-k, \-\-kernel\fP"
Search in
.IR /proc/self/mountinfo .
The output is in the tree-like format.  This is the default.

.IP "\fB\-A, \-\-all\fP"
Disable all built-in filters and print all filesystems.
.IP "\fB\-a, \-\-ascii\fP"
Use ascii characters for tree formatting.
.IP "\fB\-c, \-\-canonicalize\fP"
Canonicalize all printed paths.
.IP "\fB\-D, \-\-df\fP"
Imitate the output of df(1). This option is equivalent to
"-o SOURCE,FSTYPE,SIZE,USED,AVAIL,USE%,TARGET", but excludes all
pseudo filesystem. Use \fB\-\-all\fP to print all filesystems.
.IP "\fB\-d, \-\-direction \fIword\fP"
The search direction -
.IR forward
or
.IR backward .
.IP "\fB\-e, \-\-evaluate\fP"
Convert all tags (LABEL, UUID, PARTUUID or PARTLABEL) to the device names.
.IP "\fB\-F, \-\-tab\-file \fIpath\fP"
Search in an alternative file, if used with \fB\-\-fstab\fP, \fB\-\-mtab\fP
or \fB\-\-kernel\fP then overwrites the default paths, if specified more than
once, then tree-like output is disabled (see the \fB\-\-list\fP option).
.IP "\fB\-f, \-\-first\-only\fP"
Print the first matching filesystem only.
.IP "\fB\-i, \-\-invert\fP"
Invert the sense of matching.
.IP "\fB\-l, \-\-list\fP"
Use the list output format. This output format is automatically enabled if the
output is restricted by \fB\-t\fP, \fB\-O\fP, \fB\-S\fP or \fB\-T\fP
option and the option \fB\-\-submounts\fP is not used or if more that one
source file (the option \fB\-F\fP) is specified.
.IP "\fB\-v, \-\-nofsroot\fP"
Do not print a [/dir] in the SOURCE column for bind-mounts or btrfs subvolumes.
.IP "\fB\-N, \-\-task \fItid\fP"
Use alternative namespace /proc/<tid>/mountinfo rather than the default
/proc/self/mountinfo. If the option is specified more than once, then
tree-like output is disabled (see the \fB\-\-list\fP option). See also
.BR unshare (1)
command.
.IP "\fB\-n, \-\-noheadings\fP"
Do not print a header line.
.IP "\fB\-u, \-\-notruncate\fP"
Do not truncate text in columns.  The default is to not truncate the
.BR TARGET ,
.BR SOURCE ,
.BR UUID ,
.BR LABEL ,
.BR PARTUUID ,
.BR PARTLABEL
columns.  This option disables text truncation also in all other columns.
.IP "\fB\-O, \-\-options \fIlist\fP"
Limit the set of printed filesystems.  More than one option
may be specified in a comma-separated list.  The
.B \-t
and
.B \-O
options are cumulative in effect.  It is different from
.B \-t
in that each option is matched exactly; a leading
.I no
at the beginning does not have global meaning. The "no" could used for
individual items in the list. The "no" prefix interpratation could be disabled
by "+" prefix.
.IP "\fB\-o, \-\-output \fIlist\fP"
Define output columns. See the \fB\-\-help\fP output to get list of the
currently supported columns. The
.BR TARGET
column contains tree formatting if the
.B \-\-list
or
.B \-\-raw
options are not specified.

The default list of columns may be extended if \fIlist\fP is
specified in the format \fI+list\fP (e.g. \fBfindmnt -o +PROPAGATION\fP).
.IP "\fB\-p, \-\-poll\fR[\fI=list\fR]\fP"
Monitor changes in the /proc/self/mountinfo file. Supported actions are: mount,
umount, remount and move. More than one action may be specified in a
comma-separated list. All actions are monitored by default.

The time for which \fB--poll\fR will block can be restricted with the \fB\-\-timeout\fP
or \fB\-\-first-only\fP options.

The standard columns always use the new version of the information from the
mountinfo file, except the umount action which is based on the original
information cached by
.BR findmnt (8) .
The poll mode allows to use extra columns:
.RS
.TP
.B ACTION
mount, umount, move or remount action name; this column is enabled by default
.TP
.B OLD-TARGET
available for umount and move actions
.TP
.B OLD-OPTIONS
available for umount and remount actions
.RE
.IP "\fB\-P, \-\-pairs\fP"
Use key="value" output format. All potentially unsafe characters are hex-escaped (\\x<code>).
.IP "\fB\-r, \-\-raw\fP"
Use raw output format. All potentially unsafe characters are hex-escaped (\\x<code>).
.IP "\fB\-t, \-\-types \fIlist\fP"
Limit the set of printed filesystems.  More than one type may be
specified in a comma-separated list.  The list of filesystem types can be
prefixed with
.I no
to specify the filesystem types on which no action should be taken.  For
more details see
.BR mount (8).
.IP "\fB\-R, \-\-submounts\fP"
Print recursively all submounts for the selected filesystems.  The restrictions
defined by options \fB\-t\fP, \fB\-O\fP, \fB\-S\fP, \fB\-T\fP and
\fB\--direction\fP are not applied to submounts.  All submounts are always
printed in tree-like order.  The option enables the tree-like output format by
default.  This option has no effect for \fB\-\-mtab\fP or \fB\-\-fstab\fP.
.IP "\fB\-S, \-\-source \fIspec\fP"
Explicitly define the mount source.  Supported are \fIdevice\fR, \fImaj:min\fR,
\fILABEL=\fR, \fIUUID=\fR, \fIPARTLABEL=\fR or \fIPARTUUID=\fR.
.IP "\fB\-T, \-\-target \fIdir\fP"
Explicitly define the mount target (mountpoint directory).
.IP "\fB\-w, \-\-timeout \fImilliseconds\fP"
Specify an upper limit on the time for which \fB--poll\fR will block, in milliseconds.
.SH EXAMPLES
.IP "\fBfindmnt \-\-fstab \-t nfs\fP"
Prints all nfs filesystems defined in
.IR /etc/fstab .
.IP "\fBfindmnt \-\-fstab /mnt/foo\fP"
Prints all
.IR /etc/fstab
filesystems where the mountpoint directory is /mnt/foo.  It also prints bind mounts where /mnt/foo
is a source.
.IP "\fBfindmnt \-\-fstab --target /mnt/foo\fP"
Prints all
.IR /etc/fstab
filesystems where the mountpoint directory is /mnt/foo.
.IP "\fBfindmnt --fstab --evaluate\fP"
Prints all
.IR /etc/fstab
filesystems and converts LABEL= and UUID= tags to the real device names.
.IP "\fBfindmnt -n --raw --evaluate --output=target LABEL=/boot\fP"
Prints only the mountpoint where the filesystem with label "/boot" is mounted.
.IP "\fBfindmnt --poll --target /mnt/foo\fP"
Monitors mount, umount, remount and move on /mnt/foo.
.IP "\fBfindmnt --poll=umount --first-only --target /mnt/foo\fP"
Waits for /mnt/foo umount.
.IP "\fBfindmnt --poll=remount -t ext3 -O ro\fP"
Monitors remounts to read-only mode on all ext3 filesystems.
.SH ENVIRONMENT
.IP LIBMOUNT_FSTAB=<path>
overrides the default location of the fstab file
.IP LIBMOUNT_MTAB=<path>
overrides the default location of the mtab file
.IP LIBMOUNT_DEBUG=0xffff
enables debug output
.SH AUTHORS
.nf
Karel Zak <kzak@redhat.com>
.fi
.SH SEE ALSO
.BR mount (8),
.BR fstab (5)
.SH AVAILABILITY
The findmnt command is part of the util-linux package and is available from
ftp://ftp.kernel.org/pub/linux/utils/util-linux/.