In a directory where you have a PDB file (here called rns.pdb) type the following:
pdb-model rns.pdb rns.model
pdb-pro-ss rns.pdb rns.ss
ls rns.pdb > rns.coords
ls rns.ss > rns.ribbons
pdb-res-sph rns.pdb rns.sph
grep sg rns.sph > rns_sg.sph
ls rns_sg.sph > rns.atoms
ribbons
Click; Model | rns: rns buttons
Click: File | Print Special Files | SG-bond | buttons and type: rns_sg.rcyl
Click: File | quit buttons
Type: ls rns_sg.rcyl > rns.bonds
Type: ribbons
Click: Model | rns: rns
Click: Edit | Atom Control Panel | Radius scale = 0.25 | Complexity = 1.0 | Close
Click: Edit | Bond Control Panel | Radius Scale = 1.50 | Complexity = 1.0 | Overall Color = Yellow | Close
Click: Edit | Ribbons Style Panel | Ribbon Style = Circle | Ribns Dimensions | Coil Width = 0.5 | Close | Ribns Nprimitive | Ribbons Threads = 13 | Close | Close
Click: View | Anti-alias Image | 8 Passes
Click: File | Save Image | and type: rns.rgb | Click: OK
Press: Print Screen key