-bash-3.00$ x2top -f SWNT_6_6_144.pdb -o SWNT_6_6_144.top -r SWNT_6_6_144.rtp
                         :-)  G  R  O  M  A  C  S  (-:

                 Good ROcking Metal Altar for Chronical Sinners

                            :-)  VERSION 3.3.1  (-:


      Written by David van der Spoel, Erik Lindahl, Berk Hess, and others.
       Copyright (c) 1991-2000, University of Groningen, The Netherlands.
             Copyright (c) 2001-2006, The GROMACS development team,
            check out http://www.gromacs.org for more information.

         This program is free software; you can redistribute it and/or
          modify it under the terms of the GNU General Public License
         as published by the Free Software Foundation; either version 2
             of the License, or (at your option) any later version.

                                :-)  x2top  (-:

Option     Filename  Type         Description
------------------------------------------------------------
  -f SWNT_6_6_144.pdb  Input        Generic structure: gro g96 pdb tpr tpb
                                   tpa xml
  -o SWNT_6_6_144.top  Output, Opt! Topology file
  -r SWNT_6_6_144.rtp  Output, Opt! Residue Type file used by pdb2gmx

      Option   Type  Value  Description
------------------------------------------------------
      -[no]h   bool     no  Print help info and quit
      -[no]X   bool     no  Use dialog box GUI to edit command line options
       -nice    int      0  Set the nicelevel
      -scale   real    1.1  Scaling factor for bonds with unknown atom types
                            relative to atom type O
         -ff string select  Select the force field for your simulation.
      -nexcl    int      3  Number of exclusions
    -[no]H14   bool    yes  Use 3rd neighbour interactions for hydrogen atoms
 -[no]alldih   bool     no  Generate all proper dihedrals
 -[no]remdih   bool     no  Remove dihedrals on the same bond as an improper
  -[no]pairs   bool    yes  Output 1-4 interactions (pairs) in topology file
       -name string    ICE  Name of your molecule
    -[no]pbc   bool    yes  Use periodic boundary conditions.
  -[no]param   bool     no  Print parameters in the output
  -[no]round   bool    yes  Round off measured values
         -kb   real 400000  Bonded force constant (kJ/mol/nm^2)
         -kt   real    400  Angle force constant (kJ/mol/rad^2)
         -kp   real      5  Dihedral angle force constant (kJ/mol/rad^2)

Opening library file /usr/local/gromacs/share/gromacs/top/FF.dat

Select the Force Field:
 0: GROMOS96 43a1 force field 
 1: GROMOS96 43b1 vacuum force field
 2: GROMOS96 43a2 force field (improved alkane dihedrals)
 3: GROMOS96 45a3 force field (Schuler JCC 2001 22 1205)
 4: GROMOS96 53a5 force field (JCC 2004 vol 25 pag 1656) 
 5: GROMOS96 53a6 force field (JCC 2004 vol 25 pag 1656) 
 6: OPLS-AA/L all-atom force field (2001 aminoacid dihedrals)
 7: [DEPRECATED] Gromacs force field (see manual)
 8: [DEPRECATED] Gromacs force field with hydrogens for NMR
 9: Encad all-atom force field, using scaled-down vacuum charges
10: Encad all-atom force field, using full solvent charges    
9
Looking whether force field file ffencadv.rtp exists
Opening library file /usr/local/gromacs/share/gromacs/top/ffencadv.rtp
WARNING: all CONECT records are ignored
Generating bonds from distances...
Opening library file /usr/local/gromacs/share/gromacs/top/ffencadv.atp
There are 43 type to mass translations
atom 144
Opening library file ffencadv.n2t
There are 22 name to type translations
There are 1 different atom types in your sample
Generating angles and dihedrals from bonds...
Before cleaning: 732 pairs
Before cleaning: 732 dihedrals
There are  204 dihedrals,    0 impropers,  384 angles
           552 pairs,      204 bonds and   144 atoms

gcq#297: "Cowardly refusing to create an empty archive" (GNU tar)