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To start working, you must have any Linux distribution installed on your system. Login from your Linux system and open the command terminal. Make sure you have the “util-linux” package installed on your system to start checking the mounted filesystem. For this purpose, try the below “apt” command followed by the keyword “install” in a shell. Instantly, the installation will be completed, and you can now check the mounted filesystem.
$ sudo apt install util-linux
There are many methods available to check the file system on your system. We will illustrate each one of them one by one.
Method 01: Using Findmnt Command
Our first and most used way in the Linux system to know the filesystem type is the “findmnt” command. The “findmnt” command helps us find all the mounted filesystems. Let's start working on it. To see the list of mounted filesystems, type the simple “findmnt” command in the shell as below, which will list all the filesystems in a tree-type format. This snapshot contains all the necessary details about the filesystem; its type, source, and many more. It is clear from the image that our main filesystem is “ext4”.
$ findmnt
Let us display the filesystems in a simple format using the below “findmnt” command with a “-l” flag.
$ findmnt -l
We can list the type of our mounted filesystem using the findmnt command along with the “-t” flag followed by the name of the filesystem, e.g., “ext4”. So, execute the below-stated command in the shell. The output shows the information regarding the “ext4” filesystem.
$ findmnt -t ext4
To see the “df” style list of output about the filesystem, you have to use the below command. You can see that it will show extra information regarding the filesystems and their sources.
$ findmnt --df
You can use the modified form of this command as follows:
$ findmnt -D
If you want to search for the configured filesystem in a particular device, you can do so using the below command. You can see that the output shows the “vfat” type filesystem for the specific device.
$ findmnt /dev/sda1
If you want to see the mount point of a filesystem, try using the below “findmnt” command followed by the backslash “/” sign.
$ findmnt /
If you want to know more details about the filesystem, use the man command as follows:
$ man findmnt
The output is shown below.
Method 02: Using Blkid Command
In most cases, the “findmnt” command will be enough in knowing the filesystem's type, but there are some alternative commands for this purpose. One of them is the “blkid” command which we don't need to mount. After the execution of the “blkid” command below, along with the “sudo” keyword, we will be able to display all the block devices along with the filesystem type.
$ sudo blkid
We can use the “blkid” command to know the filesystem for the particular device.
$ sudo blkid /dev/sda1
To see extra details about the filesystem, try the below command:
$ sudo blkid -po udev /dev/sda1
For further details try the man command below:
$ man blkid
The output is given below.
Method 03: Using DF Command
The DF command is cast-off to know the disk space usage of the filesystem. Use it with the “-T” flag to know all the filesystem's types.
$ df -T
Go through the man page to know more.
$ man df
The detail is given in the snapshot.
Method 04: Using File Command
Another method to check the mounted file system is using the “file” command in the shell. You can use it for files having no extension. Hence, execute the below command to know the filesystem for a partition. It may require your password to function.
$ sudo file -sL /dev/sda1
To have extra information, try the below man command in the shell.
$ man file
You can see the details on the main page as shown in the appended image.
Method 05: Usinf Fsck Command
The “fsck” command may be used to verify or restore the reliability of a filesystem by providing the partition as an argument. You will decide what sort of filesystem it is.
$ fsck -N /dev/sda1
For further details, have a look at the main page.
$ man fsck
And you can see the details shown below.
Method 06: Using Fstab Command
Another new way to view the filesystem is using the “fstab” in the cat command. Therefore, try executing the below cat command in the shell.
$ cat /etc/fstab
For extra details, try the same man command along with the keyword “fstab”.
$ man fstab
Now you will be having details about the filesystem, as shown in the image attached.
Method 07: Using Lsblk Command
The “lsbkl” command will show the filesystem types and the devices.
$ lsblk -f
Run the below man command to see the details.
$ man lsblk
And the extra information regarding the filesystem is displayed below.
Method 08: Using grep Command
Last but not least, the “grep” command is used to check the filesystem.
$ mount | grep “^/dev”
Conclusion:
We have done all the commands to check the mounted filesystem. I hope you can easily check the mounted filesystem in your Linux distribution.
