[chimerax-users] Closest distance list between residues/atoms; And selecting first/last residue in a chain

Hi Is there a way by command line to generate a list of residue to residue (or atom to atom) distances ranked by closest to furthest, for say, all residues within 4A of each other at an interface between two protein chains? Can it also state the type of interaction, e.g. salt bridge, H-bond, vdW? Also, completely separately, is there a way by command line to select the first and last residue in a chain (without having to find their number)? No worries if not. Thanks so much! Cheers, Paul