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<title>3.10. Input script command style — LAMMPS documentation</title>
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<li class="toctree-l1"><a class="reference internal" href="Install.html">2. Install LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Build.html">3. Build LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Run_head.html">4. Run LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Commands.html">5. Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Speed.html">7. Accelerate performance</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Howto.html">8. Howto discussions</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Examples.html">9. Example scripts</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Tools.html">10. Auxiliary tools</a></li>
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<p class="caption" role="heading"><span class="caption-text">Programmer Guide</span></p>
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<li class="toctree-l1"><a class="reference internal" href="Library.html">1. LAMMPS Library Interfaces</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Python_head.html">2. Use Python with LAMMPS</a></li>
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<li class="toctree-l1 current"><a class="reference internal" href="Modify.html">3. Modifying & extending LAMMPS</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="Modify_overview.html">3.1. Overview</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_contribute.html">3.2. Submitting new features for inclusion in LAMMPS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_requirements.html">3.3. Requirements for contributions to LAMMPS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_style.html">3.4. LAMMPS programming style</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_atom.html">3.5. Atom styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_pair.html">3.6. Pair styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_bond.html">3.7. Bond, angle, dihedral, improper styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_compute.html">3.8. Compute styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_fix.html">3.9. Fix styles</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">3.10. Input script command style</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_dump.html">3.11. Dump styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_kspace.html">3.12. Kspace styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_min.html">3.13. Minimization styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_region.html">3.14. Region styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_body.html">3.15. Body styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_gran_sub_mod.html">3.16. Granular Sub-Model styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_thermo.html">3.17. Thermodynamic output options</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_variable.html">3.18. Variable options</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Developer.html">4. Information for Developers</a></li>
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<p class="caption" role="heading"><span class="caption-text">Command Reference</span></p>
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<li class="toctree-l1"><a class="reference internal" href="fixes.html">Fix Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="computes.html">Compute Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="pairs.html">Pair Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="dihedrals.html">Dihedral Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="impropers.html">Improper Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="dumps.html">Dump Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="fix_modify_atc_commands.html">fix_modify AtC commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Bibliography.html">Bibliography</a></li>
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<li class="breadcrumb-item active"><span class="section-number">3.10. </span>Input script command style</li>
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<a href="https://www.lammps.org"><img src="_static/lammps-logo.png" width="64" height="16" alt="LAMMPS Homepage"></a> | <a href="Commands_all.html">Commands</a>
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<p><span class="math notranslate nohighlight">\(\renewcommand{\AA}{\text{Å}}\)</span></p>
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<section id="input-script-command-style">
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<h1><span class="section-number">3.10. </span>Input script command style<a class="headerlink" href="#input-script-command-style" title="Link to this heading"></a></h1>
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<p>New commands can be added to LAMMPS input scripts by adding new classes
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that are derived from the Command class and thus must have a “command”
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method. For example, the create_atoms, read_data, velocity, and run
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commands are all implemented in this fashion. When such a command is
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encountered in the LAMMPS input script, LAMMPS simply creates a class
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instance with the corresponding name, invokes the “command” method of
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the class, and passes it the arguments from the input script. The
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command method can perform whatever operations it wishes on LAMMPS data
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structures.</p>
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<p>The single method your new class must define is as follows:</p>
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<table class="docutils align-default">
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<tbody>
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<tr class="row-odd"><td><p>command</p></td>
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<td><p>operations performed by the new command</p></td>
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</tr>
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</tbody>
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</table>
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<p>Of course, the new class can define other methods and variables as
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needed.</p>
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