blkid

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Wat het doet

blkid reads the signatures on block devices and prints them as NAME="value" pairs: UUID, LABEL, TYPE, PARTUUID, PARTLABEL. Without root it may show cached (old) data; run it as root for fresh values.

Zo schrijf je het

blkid [OPTION]... [DEVICE]...
blkid -L LABEL | -U UUID

Opties 20

Meest gebruikt

-s, --match-tag TAG: Show only this tag (UUID, LABEL, TYPE …).
-o, --output FORMAT: value, device, export, full, list, udev.
-L, --label LABEL: Print the device with this label.
-U, --uuid UUID: Print the device with this UUID.
-t, --match-token NAME=VALUE: Only devices with this tag value, like TYPE=xfs.
-n, --match-types LIST: Only these file system types (with -p).
-u, --usages LIST: Only these usages (filesystem, raid, crypto, other).
-p, --probe: Low-level probe, no cache.
-i, --info: I/O limits of the device.
-k, --list-filesystems: List all known types.
-l, --list-one: Only the best match (with -t).
-c, --cache-file FILE: Use another cache file.
-g, --garbage-collect: Clean the cache.
-d, --no-encoding: Do not encode special characters.
-D, --no-part-details: No partition table details.
-H, --hint SETTING: Probing hints.
-O, --offset OFFSET: Probe at an offset.
-S, --size SIZE: Size of the device to probe.
-h, --help: Show help.
-V, --version: Show the version.

Voorbeelden 10

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

1All devices

#blkid
/dev/vdb1: LABEL="data" UUID="4e5c7a6b-3f1d-4c2e-9a5b-7d2f8e1c0a93" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="2a9b…"

UUID for fstab, TYPE for the type field.

2One device
```
#blkid /dev/vdb1
```
Only that partition.

3Only the UUID value

#blkid -s UUID -o value /dev/vdb1
4e5c7a6b-3f1d-4c2e-9a5b-7d2f8e1c0a93

Perfect for scripts.

4Add an fstab line without typing the UUID

#echo "UUID=$(blkid -s UUID -o value /dev/vdb1) /data xfs defaults 0 0" >> /etc/fstab

No typing mistakes.

5Find the device of a UUID or label

#blkid -U 4e5c7a6b-3f1d-4c2e-9a5b-7d2f8e1c0a93
/dev/vdb1
#blkid -L data

The reverse lookup.

6All XFS file systems
```
#blkid -t TYPE=xfs
```
Filter by type.

7As shell variables

#eval $(blkid -o export /dev/vdb1); echo $TYPE $UUID

Use the values in a script.

8Probe without cache
```
#blkid -p /dev/vdb1
```
Fresh data, also for partitions without a file system.
9Find duplicate UUIDs (cloned disks)
```
#blkid -s UUID -o value | sort | uniq -d
```
Duplicates cause mount and LVM problems.
10Find encrypted volumes
```
#blkid -t TYPE=crypto_LUKS
```
LUKS-encrypted partitions.

Exitcodes

0 :: Done. 2 :: Nothing found. 4 :: Usage error. 8 :: Ambivalent result (more than one signature).

`blkid`

Wat het doet

Zo schrijf je het

Opties 20

Voorbeelden 10

1All devices

2One device

3Only the UUID value

4Add an fstab line without typing the UUID

5Find the device of a UUID or label

6All XFS file systems

7As shell variables

8Probe without cache

9Find duplicate UUIDs (cloned disks)

10Find encrypted volumes

Exitcodes

Volledige handleiding

Wat het doet

Zo schrijf je het

Opties 20

Voorbeelden 10

1All devices

2One device

3Only the UUID value

4Add an fstab line without typing the UUID

5Find the device of a UUID or label

6All XFS file systems

7As shell variables

8Probe without cache

9Find duplicate UUIDs (cloned disks)

10Find encrypted volumes

Exitcodes

Verwante commando's

Gebruikt in deze lessen

Gebruikt in deze labs

Volledige handleiding

`blkid`