What version of linux is running (determine installed version) ?

Determine the Installed Version of Redhat-based Systems:

cat /etc/redhat-release

or

cat /etc/issue

you will see something like:

Linux version 2.4.21-15.EL (bhcompile@bugs.build.redhat.com) (gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-34)) #1 Thu Apr 22 00:27:41 EDT 2004

ls /etc/*release*
ls /etc/*version*

will give you a file that contains the version. Then use cat 'filename_found_ls'


For kernel version, go to a terminal and run:

uname -a