On Gentoo I see you can get this with
but on Mac I get
No such file or directory
What is the equivalent for OS X?
From terminal, you'll want to start with
Also, much more data is available from
ioreg but you'll need to parse the output (which can arrive as XML if you prefer) to get things like actual bus and clock frequency of each core.
On the other hand, if you don't want processor name, speed, the number of processors, etc but you're interested in the model number, you might want to give
sysctl -n machdep.cpu.brand_string a try, eg.
$ sysctl -n machdep.cpu.brand_string Intel(R) Core(TM)2 Duo CPU E7600 @ 3.06GHz