1. uname -a
~$ uname -a Linux lubuntu-Vostro-A840 3.19.0-73-generic #81-Ubuntu SMP Tue Oct 18 16:02:31 UTC 2016 i686 i686 i686 GNU/Linux
2. cat /proc/version
:~$ cat /proc/version Linux version 3.19.0-73-generic (buildd@lgw01-54) (gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13) ) #81-Ubuntu SMP Tue Oct 18 16:02:31 UTC 2016
3. cat /etc/os-release
:~$ cat /etc/os-release NAME="Ubuntu" VERSION="15.04 (Vivid Vervet)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 15.04" VERSION_ID="15.04" HOME_URL="http://www.ubuntu.com/" SUPPORT_URL="http://help.ubuntu.com/" BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"