All stepper motors have continuous rotation, meaning they can freely spin 360 degrees and is positionable in any fraction up to the resolution of the step (e.g. .9 [400 steps/rev], 1.8 degrees [200 steps/rev). Stepper motors themselves don't have the capability to position linear. You'd have to have some sort of mechanism for translating the rotational movement into a linear one. This typically would be done with belts and pullys, a lead screw, etc. There are stepper linear actuators that would directly move linearly.
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