How to get the OS X system version?

Question

I want to get the OS X system version, such as: 10.5.4, 10.4.8, etc. I want to get it in my app, how do I do this? Thanks!

Answer 1

After 10_10, 8_0 were presented the better & simplest way would be
[NSProcessInfo processInfo].operatingSystemVersion
which will return
NSOperatingSystemVersion struct
with all 3 numbers.