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

INSTALL

sudo apt install util-linux

sudo dnf install util-linux

sudo pacman -S util-linux

sudo apk add findmnt

sudo zypper install util-linux

brew install util-linux

nix profile install nixpkgs#util-linux

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.