How to check version information on Linux system?

1. Enter "uname -a" to display information about the computer and operating system.

$ uname -a
Linux hadoop02.zjl.com 2.6.32-696.el6.x86_64 #1 SMP Tue Mar 21 19:29:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

2. Enter "cat /proc/version" to indicate the running kernel version.

$ cat /proc/version
Linux version 2.6.32-696.el6.x86_64 (mockbuild@c1bm.rdu2.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7 -18) (GCC) ) #1 SMP Tue Mar 21 19:29:05 UTC 2017

3. Enter "cat /etc/issue", the release version information is displayed

$ cat /etc/issue
CentOS release 6.9 (Final)
Kernel \r on an \m

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