Hello: I'm doing Martínez Seara simulation and i want to run this command: echo "0"|trjconv -f dppc128_1-nj-ct.xtc -s dppc128_1.tpr -o dppc128_1-nj -ct -nobox.xtc -box 100 100 100 but it appears: Invalid command line argument: -nobox.xtc Iḿ using GROMACS 5.0.2 and working in a cluster. What can i do? Alfonso