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All files accessible in a Linux system are arranged in one big tree, the file hierarchy, rooted at /. These files can be spread out over several devices and they can be remote or local file system. Linux supports numerous file system types. For example it supports Ext2,. Ext3, NFS, FA16, FAT32, NTFS,Sysfs, Procfs etc. To determine the file system type or to find out what type of file systems currently mounted you need to use command called mount or df.
df command report filesystem disk space usage and if you pass -T option it will report filesystem type. As you see second command displays file system type (ext3).
As you can see, second last column displays the file system type. For example first line [/dev/hdb1 on / type ext3 (rw,errors=remount-ro)] can be interpreted as follows: