findmnt

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Wat het doet

findmnt lists all mounts with source, type and options — clearer than mount. With a folder or device it shows only that mount. findmnt --verify checks every line of /etc/fstab (devices, mount points, types) — use it after editing fstab, before a reboot.

Zo schrijf je het

findmnt [OPTION]... [DEVICE|MOUNTPOINT]
findmnt [OPTION]... [--source] DEVICE [--target PATH]

Opties 43

Meest gebruikt

Select

-s, --fstab: Look in /etc/fstab instead of the kernel list.
-m, --mtab: Look in /etc/mtab.
-k, --kernel: Look in the kernel mount table (default).
-t, --types LIST: Only these types (like xfs,ext4; noxfs = not).
-O, --options LIST: Only mounts with these options.
-S, --source SPEC: Search by source (device, UUID=, LABEL=).
-T, --target PATH: Search by mount point (or the mount that contains PATH).
-M, --mountpoint PATH: Same as --target.
-N, --task TID: Use the mount namespace of this task.
-R, --submounts: Also show the sub-mounts.
-f, --first-only: Only the first match.
--real: Only real file systems.
--pseudo: Only pseudo file systems.
--shadow, --shadowed: Only mounts hidden by another mount.
--deleted: Only mounts of deleted files.
-d, --direction forward|backward: Search direction.
-F, --tab-file PATH: Use another file.

Check

-x, --verify: Check the fstab file for errors.
--verbose: More detail with --verify.
-p, --poll[=LIST]: Watch for mount changes (mount, umount, remount, move).
-w, --timeout MS: Stop polling after this time.

Output

-D, --df: Output like df (size, used, avail).
-o, --output LIST: Choose columns (SOURCE,TARGET,FSTYPE,OPTIONS,UUID …).
--output-all: All columns.
-n, --noheadings: No header line.
-l, --list: List instead of a tree.
--tree: Tree output (default).
-r, --raw: Raw output.
-P, --pairs: KEY="value" output.
-J, --json: JSON output.
-y, --shell: Column names usable as shell variables.
-e, --evaluate: Turn LABEL=/UUID= into device names.
-c, --canonicalize: Canonical paths.
-C, --nocanonicalize: Do not resolve paths.
-v, --nofsroot: Do not show [/dir] for bind mounts.
-U, --uniq: Ignore duplicates.
-u, --notruncate: Do not cut text.
-a, --ascii: ASCII tree lines.
-b, --bytes: Sizes in bytes.
-i, --invert: Invert the -t and -O match.
--vfs-all: Show all VFS options.
-h, --help: Show help.
-V, --version: Show the version.

Voorbeelden 11

$ als gewone gebruiker# als root (of met sudo)

1All mounts as a tree
```
$findmnt
```
Source, type and options for every mount.

2One mount point

$findmnt /data
TARGET SOURCE    FSTYPE OPTIONS
/data  /dev/vdb1 xfs    rw,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,noquota

Exit code 1 when nothing is mounted there.

3Check /etc/fstab before reboot
```
#findmnt --verify
Success, no errors or warnings detected
```
Catches wrong UUIDs, missing folders and typos.
4Only real disk file systems
```
$findmnt -t xfs,ext4,vfat
```
Without proc, sys, cgroup …
5Like df
```
$findmnt -D
```
Size and use per mount.
6Which file system holds a file?
```
$findmnt -T /var/log/messages
```
Shows the mount that contains this path.
7What is in fstab?
```
$findmnt -s
```
The fstab lines as a table.
8Find mounts without noexec (security)
```
$findmnt -O noexec -i -n -o TARGET -t xfs,ext4,tmpfs
```
Folders where users could run programs.
9Get the device of a mount for scripts
```
$findmnt -n -o SOURCE /
/dev/mapper/rhel-root
```
Clean value.
10Watch mount changes live
```
$findmnt -p
```
Shows mounts and unmounts as they happen (Ctrl+C to stop).

11JSON for monitoring

$findmnt -J -o TARGET,FSTYPE,SIZE,USE% -t xfs

Feed a dashboard.

Exitcodes

0 :: Found (or verify OK). 1 :: Nothing found (or verify found errors).

`findmnt`

Wat het doet

Zo schrijf je het

Opties 43

Select

Check

Output

Voorbeelden 11

1All mounts as a tree

2One mount point

3Check /etc/fstab before reboot

4Only real disk file systems

5Like df

6Which file system holds a file?

7What is in fstab?

8Find mounts without noexec (security)

9Get the device of a mount for scripts

10Watch mount changes live

11JSON for monitoring

Exitcodes

Volledige handleiding

Wat het doet

Zo schrijf je het

Opties 43

Select

Check

Output

Voorbeelden 11

1All mounts as a tree

2One mount point

3Check /etc/fstab before reboot

4Only real disk file systems

5Like df

6Which file system holds a file?

7What is in fstab?

8Find mounts without noexec (security)

9Get the device of a mount for scripts

10Watch mount changes live

11JSON for monitoring

Exitcodes

Verwante commando's

Gebruikt in deze lessen

Gebruikt in deze labs

Volledige handleiding

`findmnt`