Dear Mark Thanks for your reply.
I googled file permission in linux OS. After that I did following steps: I created a directory entitled input. I put pdb and mdp files in the input directory. I used following command to change permission: chmod -R 777 input Now I will md simulation steps (pdb2gmx .... editconf ..........) Is my manner true? -- 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.
