Filesystem

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A filesystem is a subsystem of a UNIX system. It is built on top of secondary storage devices but not limited to that and can also be built on top of primary storage devices (RAM) or be an entirely virtual filesystem. A UNIX system cannot operate without bootstrapping itself and programs from the filesystem.

To view files in a filesystem the command ls is used.


List of filesystems available in UNIX and UNIX-like Operating Systems


Unix File System (ufs)

Most UNIX'es have the ufs filesystem it is derived from the Berkeley ffs filesystem.


Berkeley Fast File System (FFS)

The ffs filesystem was written at UCB by Marshall Kirk McKusick for 4.2BSD. It is still widely used in the BSD family of Operating Systems.


Memory File System (mfs)

The mfs filesystem resides in RAM but is available as a file system. When the system powers off any files left in the mfs filesystem will vanish.


Proc File System (procfs)

The procfs filesystem is a filesystem that represents the process namespace of a system. You can see all processes listed here and when you change into the directories of the processes and list further attributes about the specific process.


Device File System (devfs)

Union File System (unionfs)

Kern File System (kernfs)

Bind File System (bindfs)

Null File System (nullfs)

Ext2 File System (ext2fs)

Ext3 File System (ext3fs)

Reiser File System (ReiserFS)

X File System (xfs)