The best way to know your Linux system is by using Linux command “uname”. Here are few commands with its option.
1. uname -s
Linux

2. uname -r
3.13.0-24-generic
46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014

3. uname -v
To display its kernel release
To display its kernel release date.

4. uname -m
x86_64
To display its machine hardware architecture.
5. uname -o
GNU/Linux
To display its Operating System.

6. uname -a
Linux saggi-A6200 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
To display all information at once.