Hello,<br><br>I have two structures to superimpose using the match command in chimera. Once the structures are matched, I save the two models in one pdb file. I can then just view this pdb file whenever I want. My question is: can I somehow just do this using the terminal? Meaning the graphic of chimera doesn't launch, but I get the pdb file that has the correct rotation matrix of the two superimposed structures. I don't have much programming experience, and I have no knowledge of calculating rmsd. Would appreciate if someone would pinpoint me where to start. Thanks.<br>