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How to Determine the File System Type in Linux (Ext2, Ext3 or Ext4)?
The file systems in Linux can be of different types. They support different file sizes and some mechanism like journaling etc. Also different types of file systems are supported by different Linux Kernel systems. So for the devices which are available as memory in the Linux System, we can determine their file types by using the following commands.
Using lsblk
This command dispalys all the attached divices as well as their file types and partitions.
$ lsblk -f
Running the above code gives us the following result −
NAME FSTYPE LABEL UUID MOUNTPOINT sr0 sda ├─sda2 ├─sda5 swap 02a54ace-c5c2-41cf-a679-acd9b460ee79 [SWAP] └─sda1 ext4 ae7c051f-451b-45ad-80a3-347c70a9de5e /
Using file
It gives the disk file system type.
$ sudo file -sL /dev/sda1 [sudo] password for ubuntu:
Running the above code gives us the following result −
/dev/sda1: Linux rev 1.0 ext4 filesystem data, UUID=ae7c051f-451b-45ad-80a3-347c70a9de5e (needs journal recovery) (extents) (large files) (huge files)
Using fsck
Though fsck is mostly used to repair the file system, it also checks the file types.
$ fsck -N /dev/sda1
Running the above code gives us the following result −
fsck from util-linux 2.27.1 [/sbin/fsck.ext4 (1) -- /] fsck.ext4 /dev/sda1
Looking into /etc/fstab
This is a file which contains the details on mount points,file system types etc. We just have to use the cat command to get it’s content.
cat /etc/fstab
Running the above code gives us the following result −
# /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/sda1 during installation UUID=ae7c051f-451b-45ad-80a3-347c70a9de5e / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=02a54ace-c5c2-41cf-a679-acd9b460ee79 none swap sw 0 0 /dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
Using df
The df command with the option of –Th gives a very detailed view of the file types data along with percentage usage and mount point details.
$ df -Th
Running the above code gives us the following result −
Filesystem Type Size Used Avail Use% Mounted on udev devtmpfs 1.9G 0 1.9G 0% /dev tmpfs tmpfs 393M 12M 382M 3% /run /dev/sda1 ext4 19G 4.8G 13G 28% / tmpfs tmpfs 2.0G 420K 2.0G 1% /dev/shm tmpfs tmpfs 5.0M 4.0K 5.0M 1% /run/lock tmpfs tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup tmpfs tmpfs 393M 80K 393M 1% /run/user/1000
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