What file system do I have installed?

Is there any way to check it from command line?

You can also check it by df -T

Sample output:

Filesystem    Type   1K-blocks      Used Available Use% Mounted on
/dev/hdb1     ext3    19228276  14737848   3513680  81% / 
tmpfs        tmpfs      383960         4    383956   1% /dev/shm

You can also try df -hT

From man df:

-h, --human-readable
              print sizes in human readable format (e.g., 1K 234M 2G)
-T, --print-type
              print file system type

Just type mount, it will show all mounted devices and what fs type they are mounted as.

You could also do a sudo fdisk -l

nits@nits-excalibur:~$ sudo fdisk -l
[sudo] password for nits: 
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x27edc0d3

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848   188743679    94268416    7  HPFS/NTFS/exFAT
/dev/sda3       224569342   976771071   376100865    5  Extended
/dev/sda4       188743680   224567295    17911808   83  Linux
/dev/sda5       224569344   434284543   104857600    7  HPFS/NTFS/exFAT
/dev/sda6       434286592   644001791   104857600    7  HPFS/NTFS/exFAT
/dev/sda7       644003840   684001279    19998720   83  Linux
/dev/sda8       684003328   704002047     9999360   83  Linux
/dev/sda9       804003840   972767231    84381696   83  Linux
/dev/sda10      704004096   744001535    19998720   83  Linux
/dev/sda11      744003584   803987455    29991936   83  Linux
/dev/sda12      972769280   976771071     2000896   82  Linux swap / Solaris

Partition table entries are not in disk order

sudo blkid gives you information about the format of the partition along with its UUID and label if any.

nits@nits-excalibur:~$ sudo blkid
[sudo] password for nits: 
/dev/sda1: LABEL="System Reserved" UUID="22F2DE0DF2DDE4D7" TYPE="ntfs" 
/dev/sda2: UUID="6E5E0E255E0DE6A5" TYPE="ntfs" 
/dev/sda4: LABEL="TestDrive" UUID="e6e47b0b-4c88-43f9-9165-81b2c1af4d1c" TYPE="ext4" 
/dev/sda5: LABEL="Storage_1" UUID="42DC637EDC636B5D" TYPE="ntfs" 
/dev/sda6: LABEL="Storage_2" UUID="D890877C9087603C" TYPE="ntfs" 
/dev/sda7: UUID="b73e274d-fdb2-45ac-acfe-9fcb48631ff7" TYPE="ext4" 
/dev/sda8: UUID="831304eb-1ee5-486c-a4a4-ef40b6c2d4dc" TYPE="ext4" 
/dev/sda9: UUID="9ba518d1-4a03-4b92-9b31-15db045c8cd4" TYPE="ext4" 
/dev/sda10: UUID="dcc15cd3-041d-4ad2-915e-9c0dae9310c7" TYPE="ext4" 
/dev/sda11: UUID="3ad60b50-a4f3-4dff-b62e-610766e1b119" TYPE="ext4" 
/dev/sda12: UUID="5604929a-9d9e-4ab0-907f-b9479a3b55e5" TYPE="swap"

The two commands in conjunction with each other should be enough to get the information about partitions on your system.

If you want to know what filesystem types are supported by your kernel,

cat /proc/filesystems

What file system do I have installed?

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