This article regroups all the way that you have to determine the version of the kernel from a Linux software.
Information about the kernel can be found with uname command.
To determine the kernel version, enter: $ uname -r
uname -r
2.6.18-128.el5
In this example, the output shows the kernel version (2.6.18) and errata level (-128.el5) on the system. Errata levels (or erratum kernels) are kernel package updates to fix bugs.
The processor instruction type
uname -p
Example output for 64 word type
x86_64
# uname –rm
2.6.9-5.ELsmp i686
The example shows that this is a 2.6.9-5 kernel for an SMP (multiprocessor) server using Intel i686 CPUs.