Here in Germany it depends on the region. But even within one region it can be different from friend group to friend group.
I grew up in southern Germany with handshake as default greeting. Except women often get a hug instead. If you know someone well it’s more likely to greet with a hug with men grasping each other’s hand before a short hug and slap on the back. However, if you see them a lot you might just give them a nod. On the others hand id you haven’t seen them in a while they get a hug.
In East Germany, where I live now, it seems to be much more common to hug your friends. Interestingly some will put their head on the right, reaching with their left hand over your shoulder. Which can be very awkward, when you are used to the opposite and almost kiss.