How do I check the running kernel version?

You can execute:

uname -r

It will display something like

3.13.0-62-generic

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Found on https://askubuntu.com/questions/359574/how-do-i-find-out-the-kernel-version-i-am-running (view that QA to learn other commands you could use)

For Ubuntu

enter the command

# uname -r

will Print the kernel name

# uname -a 

Will Print all Information

or else we can check with cat /proc/version

For Redhat and centos

# cat /etc/redhat-release

# lsb_release –a

dmesg | grep Linux

This command reads boot logs as it startup.

Output:

[ 0.000000] Linux version 4.9.0-8-amd64 ([email protected]) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.110-3+deb9u4 (2018-08-21)