Linux: how to find OS name and version

There are three way to show your linux server infomation :

 #1 
        $ cat /etc/*-release 

 #2 
        $ lsb_release -a 

 #3 
        $ cat /proc/version 

 Output example : 

 Linux version 2.6.32-358.11.1.el6.x86_64 (mockbuild@c6b7.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC) ) #1 SMP Wed Jun 12 03:34:52 UTC 2013