Difference Between Linux and UNIX

 UNIX is copyrighted name only big companies are allowed to use the UNIX copyright and name, so IBM AIX and Sun Solaris and HP-UX all are UNIX operating systems. The Open Group holds the UNIX trademark in trust for the industry, and manages the UNIX trademark licensing program.
Most UNIX systems are commercial in nature.
Linux is a UNIX CloneBut if you consider Portable Operating System

Set backspace in Unix console

Sometimes the backspace key doesn't work for Unix. 

we can setup the backspace key to work in the console by typing the command and press backspace key.

stty erase



 it will be shown as stty erase ^H
If you have a problem using the backspace it should display you the above output.If not, it will just perform a backspace.
After doing that press CTRL+c . And now type anything

Unix filesystems explained

A filesystem is a logical collection of files on a partition or disk. A
partition is a container for information and can span an entire hard
drive if desired.
Everything in Unix is considered to be a file, including physical
devices such as DVD-ROMs, USB devices, floppy drives, and so forth.


Unix uses a hierarchical file system structure, much like an
upside-down tree, with root (/) at

Flavors of UNIX

 The table below summarizes some of the common UNIX variants and clones. While the table lists about forty different variants, the UNIX world isn't nearly as diverse as it used to be. Some of them are defunct and are listed for historical purposes. Others are on their way out. In some cases, vendors have defected to Microsoft technology. In others, mergers and acquisitions have led to the