findmnt

query and verify mounted filesystems

TLDR

List all mounted filesystems

$ findmnt

Search by device

$ findmnt /dev/sdb1

Search by mountpoint

$ findmnt /

Filter by type

$ findmnt -t ext4,btrfs

Show disk usage like df

$ findmnt -D

Find by label

$ findmnt LABEL=BigStorage

Output as JSON

$ findmnt --json

Verify fstab

$ findmnt -x --verbose

SYNOPSIS

findmnt [OPTIONS] [device|mountpoint]

DESCRIPTION

findmnt lists all mounted filesystems or searches for a filesystem by device, mountpoint, label, or UUID. It can also verify the mount table and fstab configuration for errors.

PARAMETERS

-t, --types list

Limit output to filesystems of specified types

-o, --output list

Define output columns

-l, --list

Use list output format

-D, --df

Imitate df output (show space usage)

-x, --verify

Verify mount table content

-n, --noheadings

Don't print column headings

-r, --raw

Use raw output format

-J, --json

Use JSON output format

-f, --first-only

Print the first matching filesystem only

-s, --fstab

Search in /etc/fstab instead of /proc/self/mountinfo

-S, --source spec

Explicitly define the mount source (device, LABEL=, UUID=, etc.)

-M, --mountpoint path

Explicitly define the mountpoint file or directory

-T, --target path

Find the filesystem for the given path (any file or directory)

-p, --poll[=list]

Monitor changes in /proc/self/mountinfo (actions: mount, umount, remount, move)

-R, --submounts

Print recursively all submounts for the selected filesystems

LABEL=label

Search by filesystem label

UUID=uuid

Search by filesystem UUID

CAVEATS

The verify option checks for configuration errors but does not mount anything. Output format may vary between systems and kernel versions.

HISTORY

findmnt is part of the util-linux package, providing mount information querying on Linux systems.