I can successfully output the index file by doing it step by step:
$ gmx make_ndx -f equilibration.gro $ r 1-442 $ q But I am not sure how to do it in just one line. I tried these but all could not work $ echo r 1-442 q | gmx make_ndx -f equilibration.gro $ echo "r 1-442" q | gmx make_ndx -f equilibration.gro $ echo "r 1-442" "q" | gmx make_ndx -f equilibration.gro Thank you! -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.
