How to determine file system type in linux using command

Linux supports numerous file systems, but common choices for the system disk on a block device include the ext* family (ext2, ext3 and ext4), XFS, JFS, ReiserFS and btrfs. ext4 is the latest file system of ext* family. You can determine the file system of your various mount points in the Linux system by using the below commands.

Using df -T command

[root@TestServer ~]# df -T
Filesystem     Type  1K-blocks      Used Available Use% Mounted on
/dev/sda10     ext4   41153856   8157716  30898988  21% /
tmpfs          tmpfs  49478080     10088  49467992   1% /dev/shm
/dev/sda7      ext4  103081248  47695280  50143088  49% /backup
/dev/sda3      ext4     487652     41199    420853   9% /boot
/dev/sda5      ext4  206293688  46887476 148920452  24% /home
/dev/sda8      ext4  103081248   5752368  92086000   6% /opt
/dev/sda11     ext4   41153856     49104  39007600   1% /tmp
/dev/sda6      ext4  206293688 170378332  25429596  88% /u01

[root@TestServer ~]# df -T | awk '{print $1,$2,$NF}' | grep "^/dev"
/dev/sda10 ext4 /
/dev/sda7 ext4 /backup
/dev/sda3 ext4 /boot
/dev/sda5 ext4 /home
/dev/sda8 ext4 /opt
/dev/sda11 ext4 /tmp
/dev/sda6 ext4 /u01

Using mount command

[root@TestServer ~]# mount
/dev/sda10 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda7 on /backup type ext4 (rw)
/dev/sda3 on /boot type ext4 (rw)
/dev/sda5 on /home type ext4 (rw)
/dev/sda8 on /opt type ext4 (rw)
/dev/sda11 on /tmp type ext4 (rw)
/dev/sda6 on /u01 type ext4 (rw)

Using file command

[root@TestServer ~]# file -sL /dev/sda5
/dev/sda5: Linux rev 1.0 ext4 filesystem data (needs journal recovery) (extents) (large files) (huge files)

[root@TestServer ~]# file -sL /dev/sda6
/dev/sda6: Linux rev 1.0 ext4 filesystem data (needs journal recovery) (extents) (large files) (huge files)

View /etc/fstab file

[root@TestServer ~]# cat /etc/fstab
UUID=a2e20b9e-3298-425a-8c9f-629384c2dcdd /                       ext4    defaults        1 1
UUID=8143e755-570a-4681-af5e-c2a6f3603363 /backup                 ext4    defaults        1 2
UUID=ace0ac1b-18f2-4ce3-8cff-102a6ae37958 /boot                   ext4    defaults        1 2
UUID=aae774e6-561b-45a6-b157-12b27318e012 /home                   ext4    defaults        1 2
UUID=384312ea-8cc5-477c-a95b-dd26cf5429ff /opt                    ext4    defaults        1 2
UUID=67d1fa5a-2afc-438d-83f9-889489d56e31 /tmp                    ext4    defaults        1 2
UUID=e8abe404-3597-4be1-aa3f-7855743d456f /u01                    ext4    defaults        1 2
UUID=d1727592-1bb5-46be-853f-694f57103413 swap                    swap    defaults        0 0

Using fsck command

[root@TestServer ~]# fsck -N /dev/sda3
fsck from util-linux-ng 2.17.2
[/sbin/fsck.ext4 (1) -- /boot] fsck.ext4 /dev/sda3

[root@TestServer ~]# fsck -N /dev/sda4
fsck from util-linux-ng 2.17.2
[/sbin/fsck.ext2 (1) -- /dev/sda4] fsck.ext2 /dev/sda4


[root@TestServer ~]# fsck -N /dev/sda5
fsck from util-linux-ng 2.17.2
[/sbin/fsck.ext4 (1) -- /home] fsck.ext4 /dev/sda5