https://www.ostechnix.com/how-to-find-the-mounted-filesystem-type-in-linux
As you may already know, the Linux supports numerous filesystems,
such as Ext4, ext3, ext2, sysfs, securityfs, FAT16, FAT32, NTFS, and
many. The most commonly used filesystem is Ext4. Ever wondered what type
of filesystem are you currently using in your Linux system? No? Worry
not! We got your back. This guide explains how to find the mounted
filesystem type in Unix-like operating systems.
findmnt command comes pre-installed in most Linux distributions, because it is part of the package named util-linux. Just in case if it is not available, simply install this package and you’re good to go. For instance, you can install util-linux package in Debian-based systems using command:
If you run it without any arguments/options, it will list all mounted filesystems in a tree-like format as shown below.
As you can see, the findmnt command displays the target mount point (TARGET), source device (SOURCE), file system type (FSTYPE), and relevant mount options, like whether the filesystem is read/write or read-only. (OPTIONS). In my case, my root(/) filesystem type is EXT4.
If you don’t like/want to display the output in tree-like format, use -l flag to display in simple, plain format.
You can also list a particular type of filesystem, for example ext4, using -t option.
Search for a device:
To find out the type of a filesystem using blkid command, run:
For details about df command, refer the following guide.
Also, check man pages.
Run the following command to find the filesystem type of a partition:
To view the type of a filesystem, simply run:
For more details, refer man pages.
To display info about mounted filesystems, simply run:
To find out the type of a filesystem using mount command, do:
More good stuffs to come. Stay tuned!
Cheers!
Find The Mounted Filesystem Type In Linux
There can be many ways to find the filesystem type in Linux. Here, I have given 8 different methods. Let us get started, shall we?Method 1 – Using findmnt command
This is the most commonly used method to find out the type of a filesystem. The findmnt command will list all mounted filesystems or search for a filesystem. The findmnt command can be able to search in /etc/fstab, /etc/mtab or /proc/self/mountinfo.findmnt command comes pre-installed in most Linux distributions, because it is part of the package named util-linux. Just in case if it is not available, simply install this package and you’re good to go. For instance, you can install util-linux package in Debian-based systems using command:
$ sudo apt install util-linuxLet us go ahead and see how to use findmnt command to find out the mounted filesystems.
If you run it without any arguments/options, it will list all mounted filesystems in a tree-like format as shown below.
$ findmntSample output:
As you can see, the findmnt command displays the target mount point (TARGET), source device (SOURCE), file system type (FSTYPE), and relevant mount options, like whether the filesystem is read/write or read-only. (OPTIONS). In my case, my root(/) filesystem type is EXT4.
If you don’t like/want to display the output in tree-like format, use -l flag to display in simple, plain format.
$ findmnt -l
You can also list a particular type of filesystem, for example ext4, using -t option.
$ findmnt -t ext4 TARGET SOURCE FSTYPE OPTIONS / /dev/sda2 ext4 rw,relatime,commit=360 └─/boot /dev/sda1 ext4 rw,relatime,commit=360,data=orderedFindmnt can produce df style output as well.
$ findmnt --dfOr
$ findmnt -DSample output:
SOURCE FSTYPE SIZE USED AVAIL USE% TARGET dev devtmpfs 3.9G 0 3.9G 0% /dev run tmpfs 3.9G 1.1M 3.9G 0% /run /dev/sda2 ext4 456.3G 342.5G 90.6G 75% / tmpfs tmpfs 3.9G 32.2M 3.8G 1% /dev/shm tmpfs tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup bpf bpf 0 0 0 - /sys/fs/bpf tmpfs tmpfs 3.9G 8.4M 3.9G 0% /tmp /dev/loop0 squashfs 82.1M 82.1M 0 100% /var/lib/snapd/snap/core/4327 /dev/sda1 ext4 92.8M 55.7M 30.1M 60% /boot tmpfs tmpfs 788.8M 32K 788.8M 0% /run/user/1000 gvfsd-fuse fuse.gvfsd-fuse 0 0 0 - /run/user/1000/gvfsYou can also display filesystems for a specific device, or mountpoint too.
Search for a device:
$ findmnt /dev/sda1 TARGET SOURCE FSTYPE OPTIONS /boot /dev/sda1 ext4 rw,relatime,commit=360,data=orderedSearch for a mountpoint:
$ findmnt / TARGET SOURCE FSTYPE OPTIONS / /dev/sda2 ext4 rw,relatime,commit=360You can even find filesystems with specific label:
$ findmnt LABEL=StorageFor more details, refer the man pages.
$ man findmntThe findmnt command is just enough to find the type of a mounted filesystem in Linux. It is created for that specific purpose only. However, there are also few other ways available to find out the filesystem type. If you’re interested to know, read on.
Method 2 – Using blkid command
The blkid command is used locate and print block device attributes. It is also part of the util-linux package, so you don’t bother to install it.To find out the type of a filesystem using blkid command, run:
$ blkid /dev/sda1
Method 3 – Using df command
The df command is used to report filesystem disk space usage in Unix-like operating systems. To find the type of all mounted filesystems, simply run:$ df -TSample output:
For details about df command, refer the following guide.
Also, check man pages.
$ man df
Method 4 – Using file command
The file command determines the type of a specified file. It works just fine for files with no file extension.Run the following command to find the filesystem type of a partition:
$ sudo file -sL /dev/sda1 [sudo] password for sk: /dev/sda1: Linux rev 1.0 ext4 filesystem data, UUID=83a1dbbf-1e15-4b45-94fe-134d3872af96 (needs journal recovery) (extents) (large files) (huge files)Check man pages for more details:
$ man file
Method 5 – Using fsck command
The fsck command is used to check the integrity of a filesystem or repair it. You can find the type of a filesystem by passing the partition as an argument like below.$ fsck -N /dev/sda1 fsck from util-linux 2.32 [/usr/bin/fsck.ext4 (1) -- /boot] fsck.ext4 /dev/sda1For more details, refer man pages.
$ man fsck
Method 6 – Using fstab Command
fstab is a file that contains static information about the filesystems. This file usually contains the mount point, filesystem type and mount options.To view the type of a filesystem, simply run:
$ cat /etc/fstab
For more details, refer man pages.
$ man fstab
Method 7 – Using lsblk command
The lsblk command displays the information about devices.To display info about mounted filesystems, simply run:
$ lsblk -f NAME FSTYPE LABEL UUID MOUNTPOINT loop0 squashfs /var/lib/snapd/snap/core/4327 sda ├─sda1 ext4 83a1dbbf-1e15-4b45-94fe-134d3872af96 /boot ├─sda2 ext4 4d25ddb0-5b20-40b4-ae35-ef96376d6594 / └─sda3 swap 1f8f5e2e-7c17-4f35-97e6-8bce7a4849cb [SWAP] sr0For more details, refer man pages.
$ man lsblk
Method 8 – Using mount command
The mount command is used to mount a local or remote filesystems in Unix-like systems.To find out the type of a filesystem using mount command, do:
$ mount | grep "^/dev" /dev/sda2 on / type ext4 (rw,relatime,commit=360) /dev/sda1 on /boot type ext4 (rw,relatime,commit=360,data=ordered)For more details, refer man pages.
$ man mountAnd, that’s all for now folks. You now know 8 different Linux commands to find out the type of a mounted Linux filesystems. If you know any other methods, feel free to let me know in the comment section below. I will check and update this guide accordingly.
More good stuffs to come. Stay tuned!
Cheers!
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