The first is forcetame you type this in while you are looking at the wild creature and boom you have a tame dino. The new tame will wander around a few seconds and then stop. The dino will gain extra levels via 100% taming effectiveness. There will be no sound or naming screen when the tame works. It can be hard to move from console to game screen on a moving target, so be careful of using this command with dangerous creatures.
If you want the regular taming experience where you get the naming option extra then you can use the dotame command.