int iarg = 1;

  while (iarg < narg) {

    if (strcmp(arg[iarg],"-s") == 0) {

    if (strcmp(arg[iarg],"-h") == 0) {

      printf("Syntax: restart2data switch arg ... "

	     "restart-file data-file (input-file)\n");

      printf("  optional switch = -s");

      printf("    arg = suffix to remove from style names");

      printf("  restart-file and data-file are mandatory");

      printf("  input-file is optional");

      printf("    if specified it will contain LAMMPS input script commands");

      printf("    for mass and force field info");

      printf("    only a few force field styles support this option");

    } else if (strcmp(arg[iarg],"-s") == 0) {

      if (iarg+2 > narg) {

	printf("Syntax: restart2data switch arg ... "

	       "restart-file data-file (input-file)\n");