Linux show file systems

How to get the complete and exact list of mounted filesystems in Linux?

I usually use mount to check which filesystems are mounted. I also know there is some connection between mount and /etc/mtab but I’m not sure about the details. After reading How to check if /proc/ is mounted I get more confused. My question is: How to get the most precise list of mounted filesystems? Should I just use mount , or read the contents of /etc/mtab , or contents of /proc/mounts ? What would give the most trustworthy result?

I can’t help linking to What is /etc/mtab in Linux? because it covers non-Linux details that none of the answers here give.

5 Answers 5

The definitive list of mounted filesystems is in /proc/mounts .

If you have any form of containers on your system, /proc/mounts only lists the filesystems that are in your present container. For example, in a chroot, /proc/mounts lists only the filesystems whose mount point is within the chroot. (There are ways to escape the chroot, mind.)

There’s also a list of mounted filesystems in /etc/mtab . This list is maintained by the mount and umount commands. That means that if you don’t use these commands (which is pretty rare), your action (mount or unmount) won’t be recorded. In practice, it’s mostly in a chroot that you’ll find /etc/mtab files that differ wildly from the state of the system. Also, mounts performed in the chroot will be reflected in the chroot’s /etc/mtab but not in the main /etc/mtab . Actions performed while /etc/mtab is on a read-only filesystem are also not recorded there.

The reason why you’d sometimes want to consult /etc/mtab in preference to or in addition to /proc/mounts is that because it has access to the mount command line, it’s sometimes able to present information in a way that’s easier to understand; for example you see mount options as requested (whereas /proc/mounts lists the mount and kernel defaults as well), and bind mounts appear as such in /etc/mtab .

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4 Commands to List Mounted File Systems in Linux

The Linux operating system provides multiple filesystems, including ext4, xfs, tmpfs, securityfs, and many more. This guide demonstrates various ways to list all mounted file systems in a Linux system.

1. View Linux Mounted Filesystem Using /proc Filesystem

The /proc/mounts file is a file that displays the status of all filesystems that are currently mounted on the system. The file format closely resembles that of the /etc/fstab file. The file reports the status of mounted filesystems as recorded by the Linux kernel.

Thus, to view all the mounted filesystems, view the /proc/mounts file using the cat command as shown.

2. List Linux Mounted Filesystem Using df Command

The df command is mostly used to check disk space utilization on mounted file systems. It lists, among other statistics, total disk space and available disk space on each mounted filesystem.

When the -a option is included, the df command lists all the mounted filesystems.

3. Print Linux Mounted Filesystems Using findmnt Command

The findmnt command is yet another powerful command that displays all mounted filesystems on your Linux system in a tree-like format.

To print all the mounted filesystems, simply run the command without any arguments.

This prints the output in a tree-like format as shown.

You can pass the -D option which will print the output similar to the df -Th command

Pass the -t option followed by the filesystem type to print specific filesystems. For example, to view all the mounted EXT4 filesystems, run the command:

To view all EXT4 filesystems mounted in the /etc/fstab file, run the command:

4. Show Mounted Linux Filesystem Using mount Command

You can also use the mount command to list all mounted file systems. Without any arguments, it lists all the mounted filesystems.

Summing Up

In this guide, we have explored four ways that you can use to list all mounted file systems in a Linux system. Your views and feedback on this guide are welcome.

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Как узнать файловую систему Linux

Файловая система определяет каким образом будут хранится файлы, какие правила их именования будут применяться какой максимальный размер файла, а также можно ли увеличивать или уменьшать размер раздела. В Linux существует огромное количество файловых систем. Самая популярная из них это Ext4, но кроме неё существуют Btrfs, XFS, ZFS, RaiserFS, GlusterFS и многие другие.

В этой статье мы поговорим о том как определить в какую файловую систему отформатирован раздел. Это довольно простая задача и для её решения существует множество различных утилит.

Как узнать файловую систему Linux

1. Утилита Gnome Диски

В графическом интерфейсе можно определить файловую систему с помощью утилиты Gnome Диски. Откройте программу из главного меню, затем выберите нужный диск, а потом нужный раздел. Тут вы сможете видеть куда примонтирован этот раздел и его файловую систему:

2. Утилита Gparted

Программа Gparted тоже предоставляет такую информацию. Если программа ещё не установлена для установки выполните:

Затем запустите её из главного меню и выберите нужный диск. Файловая система отображается в одноимённой колонке:

3. Команда df

Программа df в Linux позволяет узнать список примонтированных разделов, свободное место на них, а также узнать файловую систему Linux, но для этого надо добавить опцию -T. Для просмотра файловой системы только на физических дисках выполните:

В выводе утилиты много лишнего, поэтому я отфильтровал только разделы на NVMe диске.

4. Команда fsck

Если раздел ещё не примонтирован, а вам надо узнать его файловую систему в терминале, то следует использовать программу fsck. Обычно она применяется для восстановления файловых систем, но опция -N позволяет узнать файловую систему:

Вместо nvme0n1p6 вам нужно указать ваш раздел диска, например, /dev/sda1.

5. Команда lsblk

Утилита lsblk тоже позволяет выводить файловую систему. Для этого надо использовать опцию -f:

6. Команда mount

Команда mount показывает всё примонтированные разделы и их точки монтирования если её запустить без параметров. Например:

7. Команда blkid

Утилита blkid позволяет узнать параметры блочного устройства. Очень часто используется для просмотра UUID, однако может показать и файловую систему. Просто укажите устройство раздела:

8. Команда file

Обычно утилита file используется для просмотра информации о файлах. Но если применить её к блочному устройству с опцией -s, то она покажет информацию и о нём, включая файловую систему. Чтобы открывать символические ссылки используйте опцию -L:

sudo file -sL /dev/nvme0n1p6

Выводы

Из этой статьи вы узнали как узнать тип файловой системы Linux. Как видите, существует огромное количество способов, а какими пользуетесь вы? Напишите в комментариях!

Обнаружили ошибку в тексте? Сообщите мне об этом. Выделите текст с ошибкой и нажмите Ctrl+Enter.

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7 Ways to Determine the File System Type in Linux (Ext2, Ext3 or Ext4)

A file system is the way in which files are named, stored, retrieved as well as updated on a storage disk or partition; the way files are organized on the disk.

A file system is divided in two segments called: User Data and Metadata (file name, time it was created, modified time, it’s size and location in the directory hierarchy etc).

In this guide, we will explain seven ways to identify your Linux file system type such as Ext2, Ext3, Ext4, BtrFS, GlusterFS plus many more.

1. Using df Command

df command reports file system disk space usage, to include the file system type on a particular disk partition, use the -T flag as below:

$ df -Th OR $ df -Th | grep "^/dev"

For a comprehensive guide for df command usage go through our articles:

2. Using fsck Command

fsck is used to check and optionally repair Linux file systems, it can also print the file system type on specified disk partitions.

The flag -N disables checking of file system for errors, it just shows what would be done (but all we need is the file system type):

$ fsck -N /dev/sda3 $ fsck -N /dev/sdb1

3. Using lsblk Command

lsblk displays block devices, when used with the -f option, it prints file system type on partitions as well:

4. Using mount Command

mount command is used to mount a file system in Linux, it can also be used to mount an ISO image, mount remote Linux filesystem and so much more.

When run without any arguments, it prints info about disk partitions including the file system type as below:

5. Using blkid Command

blkid command is used to find or print block device properties, simply specify the disk partition as an argument like so:

6. Using file Command

file command identifies file type, the -s flag enables reading of block or character files and -L enables following of symlinks:

7. Using fstab File

The /etc/fstab is a static file system info (such as mount point, file system type, mount options etc) file:

That’s it! In this guide, we explained seven ways to identify your Linux file system type. Do you know of any method not mentioned here? Share it with us in the comments.

Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge.

Each tutorial at TecMint is created by a team of experienced Linux system administrators so that it meets our high-quality standards.

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15 thoughts on “7 Ways to Determine the File System Type in Linux (Ext2, Ext3 or Ext4)”

will create a ext2 filesystem on image1, if its not big enough (warning “Filesystem too small for a journal” means a filesystem without a journal, a.k.a. ext2, is created) If you don’t realize this and nevertheless mount it as ext4. The df and mount methods above will mirror back ext4:

$ df -Th /tmp/mnt* Filesystem Type Size Used Avail Use% Mounted on /dev/loop4 ext4 1003K 24K 908K 3% /tmp/mnt1 /dev/loop5 ext4 987K 33K 812K 4% /tmp/mnt2 $ mount | grep mnt . /home/mallikab/image1 on /tmp/mnt1 type ext4 (rw,relatime,seclabel) /home/mallikab/image2 on /tmp/mnt2 type ext4 (rw,relatime,seclabel,data=ordered)

$ fsck -N /tmp/mnt1 fsck from util-linux 2.23.2 [/sbin/fsck.ext2 (1) -- /tmp/mnt1] fsck.ext2 /tmp/mnt1 $ fsck -N /tmp/mnt2 fsck from util-linux 2.23.2 [/sbin/fsck.ext4 (1) -- /tmp/mnt2] fsck.ext4 /home/mallikab/image2 $ file -sL /home/mallikab/image2 /home/mallikab/image2: Linux rev 1.0 ext4 filesystem data, UUID=b4e8e086-54ca-4d9d-9f38-32bbed211e6b (needs journal recovery) (extents) (64bit) (huge files) $ file -sL /home/mallikab/image1 /home/mallikab/image1: Linux rev 1.0 ext2 filesystem data (mounted or unclean), UUID=09b3a8c9-0b6d-43c5-b195-c45f6c091765 (extents) (64bit) (huge files) hm, although fsck doesn't indicate ext2 unless the images are mounted, i.e. $ fsck -N ~/image1 fsck from util-linux 2.23.2 [/sbin/fsck.ext4 (1) -- /home/mallikab/image1] fsck.ext4 /home/mallikab/image1

The only working method for me was ‘ lsblk -f ‘; the other replied “fuseblk“, “HPFS/NTFS/exFAT” or nothing. Reply

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How to Show File System Type in Linux

Every object in a Linux computer is considered a file. A Linux file system is an organization that is used to store and manage files on a storage device. The storage device is logically divided using the file system to keep different types of files arranged for effective search, access, deletion, and modification. Linux supports various file systems, including ext2, ext3, and ext4.

In this tutorial, we will learn how to show file system type in Linux. We can determine it using different methods.

1. Using df — T Command

The df command, also known as disk file system type, in Linux is used to check the disk usage on a storage device. This command-line utility is pre-installed on most of the major Linux operating system distributions. By default, the df command displays only the available and used disk space, but you can use the -T flag to display the file system of all the storage devices that are mounted:

The df command in this output shows the following information:

• Filesystem – name of the currently mounted partition or the storage device.
• Type – storage device or partition file system types.
• Size – total size of the mounted partition or storage device.
• Used – consumed disk space of the mounted partition or storage device.
• Avail – amount of available disk space of the mounted partition or storage device.
• Use% – percentage of used disk space in the mounted partition or storage device.
• Mounted on – name of the directory where the partition or storage device is mounted.

To display the metadata of a specific storage device or partition, specify the partition name with the df command. For example, to check the FS of the root partition, type:

2. Using lsblk -fs Command

To identify the filesystem type -fs option with lsblk:

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