Hi, I was trying to automatize the selection of those residues members of a certain cavity predicted by CASTp, starting from the opening of the file to the writing of the residues list (all from command line). However, I do not know how to select a cavity with an specific ID so I have not to do it manually. There is a strategy to achieve this goal from the command line? How could I do the same for Surfnet cavities? Thanks in advance for your help. Best regards, *Andrés Felipe Vásquez J., BSc, MSc.* Profesional - Grupo de Fisiología Molecular Subdirección de Investigación Científica y Tecnológica Dirección de Investigación en Salud Pública Instituto Nacional de Salud Avenida calle 26 No. 51-20 - Zona 6 CAN +57 (1) 2207700 ext. 1419 Bogotá, D.C., Colombia