There isn't really any such thing. Windows is a monolithic piece of software from one vendor, Linux is a collection of thousands of pieces of software from many contributers.
uname -r is probably the closest you will get to ver, bot some distributions have release levels that you can check, for example Red Hat store it in /etc/redhat-release, SuSE in /etc/SuSE-release, ...
If you know which Linux distribution you are using that would help?
Annihilannic.