[Chimera-users] distance between two residues in multiple pdb files

Dear Chimera users, One of the ways to find distance between two residues (say, residue no 10 and residue no 15 of a pdb file) is the use of command 'distance' in the command line of Chimera. How can I use the command 'distance' for a multiple pdb files (say, 20 pdb files which are generated by simulation of a protein)? I mean, may I need some scripts for looping? Any other alternatives will also help me a lot. Thank you, Mahendra Thapa University of Cincinnati,OH