diff --git a/src/COLVARS/group_ndx.h b/src/COLVARS/group_ndx.h
index 4c1e7e93e5..c1d7c5298b 100644
--- a/src/COLVARS/group_ndx.h
+++ b/src/COLVARS/group_ndx.h
@@ -29,7 +29,7 @@ namespace LAMMPS_NS {
 class Group2Ndx : public Command {
  public:
   Group2Ndx(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   void write_group(FILE *, int);
diff --git a/src/COLVARS/ndx_group.h b/src/COLVARS/ndx_group.h
index 85831accaf..ef30f53b17 100644
--- a/src/COLVARS/ndx_group.h
+++ b/src/COLVARS/ndx_group.h
@@ -30,7 +30,7 @@ namespace LAMMPS_NS {
 class Ndx2Group : public Command {
  public:
   Ndx2Group(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   void create(const std::string &, const std::vector<tagint> &);
diff --git a/src/KIM/kim_command.h b/src/KIM/kim_command.h
index 98a9420c31..25611d4b50 100644
--- a/src/KIM/kim_command.h
+++ b/src/KIM/kim_command.h
@@ -69,7 +69,7 @@ namespace LAMMPS_NS {
 class KimCommand : public Command {
  public:
   KimCommand(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/MESSAGE/message.h b/src/MESSAGE/message.h
index cb86fa62e5..ff832f1145 100644
--- a/src/MESSAGE/message.h
+++ b/src/MESSAGE/message.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class Message : public Command {
  public:
   Message(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   void quit();
diff --git a/src/MESSAGE/server.h b/src/MESSAGE/server.h
index c06aaa6f12..e82ac7e8b0 100644
--- a/src/MESSAGE/server.h
+++ b/src/MESSAGE/server.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class Server : public Command {
  public:
   Server(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/MESSAGE/server_md.h b/src/MESSAGE/server_md.h
index e50027f0ea..bd227286b4 100644
--- a/src/MESSAGE/server_md.h
+++ b/src/MESSAGE/server_md.h
@@ -21,7 +21,7 @@ namespace LAMMPS_NS {
 class ServerMD : protected Pointers {
  public:
   ServerMD(class LAMMPS *);
-  ~ServerMD();
+  ~ServerMD() override;
   void loop();
 
  private:
diff --git a/src/PHONON/dynamical_matrix.h b/src/PHONON/dynamical_matrix.h
index cc70cd026e..122d158d55 100644
--- a/src/PHONON/dynamical_matrix.h
+++ b/src/PHONON/dynamical_matrix.h
@@ -18,8 +18,8 @@ namespace LAMMPS_NS {
 class DynamicalMatrix : public Command {
  public:
   DynamicalMatrix(class LAMMPS *);
-  virtual ~DynamicalMatrix();
-  void command(int, char **);
+  ~DynamicalMatrix() override;
+  void command(int, char **) override;
   void setup();
 
  protected:
diff --git a/src/PHONON/third_order.h b/src/PHONON/third_order.h
index fa8741cfc6..1961d52355 100644
--- a/src/PHONON/third_order.h
+++ b/src/PHONON/third_order.h
@@ -18,8 +18,8 @@ namespace LAMMPS_NS {
 class ThirdOrder : public Command {
  public:
   ThirdOrder(class LAMMPS *);
-  virtual ~ThirdOrder();
-  void command(int, char **);
+  ~ThirdOrder() override;
+  void command(int, char **) override;
   void setup();
 
  protected:
diff --git a/src/PLUGIN/plugin.h b/src/PLUGIN/plugin.h
index d98430bae6..cc1a3bf2dc 100644
--- a/src/PLUGIN/plugin.h
+++ b/src/PLUGIN/plugin.h
@@ -28,7 +28,7 @@ namespace LAMMPS_NS {
 class Plugin : public Command {
  public:
   Plugin(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 void plugin_load(const char *, LAMMPS *);
diff --git a/src/REPLICA/hyper.h b/src/REPLICA/hyper.h
index c17fc7a6d8..a6a7cc45da 100644
--- a/src/REPLICA/hyper.h
+++ b/src/REPLICA/hyper.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class Hyper : public Command {
  public:
   Hyper(class LAMMPS *);
-  ~Hyper() {}
-  void command(int, char **);
+  ~Hyper() override {}
+  void command(int, char **) override;
 
  private:
   int me, nprocs;
diff --git a/src/REPLICA/neb.h b/src/REPLICA/neb.h
index 26d3b72541..c99ab60904 100644
--- a/src/REPLICA/neb.h
+++ b/src/REPLICA/neb.h
@@ -28,8 +28,8 @@ class NEB : public Command {
  public:
   NEB(class LAMMPS *);
   NEB(class LAMMPS *, double, double, int, int, int, double *, double *);
-  ~NEB();
-  void command(int, char **);    // process neb command
+  ~NEB() override;
+  void command(int, char **) override;    // process neb command
   void run();                    // run NEB
 
   double ebf, ebr;    // forward and reverse energy barriers
diff --git a/src/REPLICA/prd.h b/src/REPLICA/prd.h
index a5342c47b8..5166380b1c 100644
--- a/src/REPLICA/prd.h
+++ b/src/REPLICA/prd.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class PRD : public Command {
  public:
   PRD(class LAMMPS *);
-  ~PRD() {}
-  void command(int, char **);
+  ~PRD() override {}
+  void command(int, char **) override;
 
  private:
   int me, nprocs;
diff --git a/src/REPLICA/tad.h b/src/REPLICA/tad.h
index 7e528acfbb..e0432db9fd 100644
--- a/src/REPLICA/tad.h
+++ b/src/REPLICA/tad.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class TAD : public Command {
  public:
   TAD(class LAMMPS *);
-  ~TAD();
-  void command(int, char **);
+  ~TAD() override;
+  void command(int, char **) override;
 
  private:
   int me, nprocs;
diff --git a/src/REPLICA/temper.h b/src/REPLICA/temper.h
index d7ebf79c33..0bce33a5f8 100644
--- a/src/REPLICA/temper.h
+++ b/src/REPLICA/temper.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class Temper : public Command {
  public:
   Temper(class LAMMPS *);
-  ~Temper();
-  void command(int, char **);
+  ~Temper() override;
+  void command(int, char **) override;
 
  private:
   int me, me_universe;                  // my proc ID in world and universe
diff --git a/src/REPLICA/temper_grem.h b/src/REPLICA/temper_grem.h
index cdcf6a26aa..2aea1e1414 100644
--- a/src/REPLICA/temper_grem.h
+++ b/src/REPLICA/temper_grem.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class TemperGrem : public Command {
  public:
   TemperGrem(class LAMMPS *);
-  ~TemperGrem();
-  void command(int, char **);
+  ~TemperGrem() override;
+  void command(int, char **) override;
 
  private:
   int me, me_universe;                  // my proc ID in world and universe
diff --git a/src/REPLICA/temper_npt.h b/src/REPLICA/temper_npt.h
index 47eec7053b..b6f37ea8c1 100644
--- a/src/REPLICA/temper_npt.h
+++ b/src/REPLICA/temper_npt.h
@@ -28,8 +28,8 @@ namespace LAMMPS_NS {
 class TemperNPT : public Command {
  public:
   TemperNPT(class LAMMPS *);
-  ~TemperNPT();
-  void command(int, char **);
+  ~TemperNPT() override;
+  void command(int, char **) override;
 
  private:
   int me, me_universe;    // my proc ID in world and universe
diff --git a/src/SPIN/neb_spin.h b/src/SPIN/neb_spin.h
index 8de68830d6..b667215520 100644
--- a/src/SPIN/neb_spin.h
+++ b/src/SPIN/neb_spin.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class NEBSpin : public Command {
  public:
   NEBSpin(class LAMMPS *);
-  ~NEBSpin();
-  void command(int, char **);    // process neb/spin command
+  ~NEBSpin() override;
+  void command(int, char **) override;    // process neb/spin command
   void run();                    // run NEBSpin
 
   double ebf, ebr;    // forward and reverse energy barriers
diff --git a/src/accelerator_kokkos.h b/src/accelerator_kokkos.h
index 0cea855f1e..a6cfdd12df 100644
--- a/src/accelerator_kokkos.h
+++ b/src/accelerator_kokkos.h
@@ -66,7 +66,6 @@ class AtomKokkos : public Atom {
  public:
   tagint **k_special;
   AtomKokkos(class LAMMPS *lmp) : Atom(lmp) {}
-  ~AtomKokkos() {}
   void sync(const ExecutionSpace /*space*/, unsigned int /*mask*/) {}
   void modified(const ExecutionSpace /*space*/, unsigned int /*mask*/) {}
 };
@@ -74,39 +73,33 @@ class AtomKokkos : public Atom {
 class CommKokkos : public CommBrick {
  public:
   CommKokkos(class LAMMPS *lmp) : CommBrick(lmp) {}
-  ~CommKokkos() {}
 };
 
 class CommTiledKokkos : public CommTiled {
  public:
   CommTiledKokkos(class LAMMPS *lmp) : CommTiled(lmp) {}
   CommTiledKokkos(class LAMMPS *lmp, Comm *oldcomm) : CommTiled(lmp, oldcomm) {}
-  ~CommTiledKokkos() {}
 };
 
 class DomainKokkos : public Domain {
  public:
   DomainKokkos(class LAMMPS *lmp) : Domain(lmp) {}
-  ~DomainKokkos() {}
 };
 
 class NeighborKokkos : public Neighbor {
  public:
   NeighborKokkos(class LAMMPS *lmp) : Neighbor(lmp) {}
-  ~NeighborKokkos() {}
 };
 
 class MemoryKokkos : public Memory {
  public:
   MemoryKokkos(class LAMMPS *lmp) : Memory(lmp) {}
-  ~MemoryKokkos() {}
   void grow_kokkos(tagint **, tagint **, int, int, const char *) {}
 };
 
 class ModifyKokkos : public Modify {
  public:
   ModifyKokkos(class LAMMPS *lmp) : Modify(lmp) {}
-  ~ModifyKokkos() {}
 };
 
 class DAT {
diff --git a/src/balance.h b/src/balance.h
index df8ac307b4..f7a3c60df5 100644
--- a/src/balance.h
+++ b/src/balance.h
@@ -33,8 +33,8 @@ class Balance : public Command {
   int outflag;                 // 1 for output of balance results to file
 
   Balance(class LAMMPS *);
-  ~Balance();
-  void command(int, char **);
+  ~Balance() override;
+  void command(int, char **) override;
   void options(int, int, char **);
   void weight_storage(char *);
   void init_imbalance(int);
diff --git a/src/change_box.h b/src/change_box.h
index cfa3a2f3e1..772a8150e5 100644
--- a/src/change_box.h
+++ b/src/change_box.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class ChangeBox : public Command {
  public:
   ChangeBox(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   int scaleflag;
diff --git a/src/citeme.h b/src/citeme.h
index 8f0e6c4bca..0d9f40f57f 100644
--- a/src/citeme.h
+++ b/src/citeme.h
@@ -22,7 +22,7 @@ namespace LAMMPS_NS {
 class CiteMe : protected Pointers {
  public:
   CiteMe(class LAMMPS *, int, int, const char *);
-  virtual ~CiteMe();
+  ~CiteMe() override;
   void add(const std::string &);    // register publication for output
   void flush();                     // flush buffers to screen and logfile
   enum { VERBOSE, TERSE };
diff --git a/src/create_atoms.h b/src/create_atoms.h
index 1d62c801e8..5b71394447 100644
--- a/src/create_atoms.h
+++ b/src/create_atoms.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class CreateAtoms : public Command {
  public:
   CreateAtoms(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   int me, nprocs;
diff --git a/src/create_bonds.h b/src/create_bonds.h
index eae90bef7f..aec0f14c6a 100644
--- a/src/create_bonds.h
+++ b/src/create_bonds.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class CreateBonds : public Command {
  public:
   CreateBonds(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   int igroup, group1bit, group2bit;
diff --git a/src/create_box.h b/src/create_box.h
index c5a24f280a..dd74755cf8 100644
--- a/src/create_box.h
+++ b/src/create_box.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class CreateBox : public Command {
  public:
   CreateBox(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/delete_atoms.h b/src/delete_atoms.h
index 07d1b1352a..161427e4ef 100644
--- a/src/delete_atoms.h
+++ b/src/delete_atoms.h
@@ -28,7 +28,7 @@ namespace LAMMPS_NS {
 class DeleteAtoms : public Command {
  public:
   DeleteAtoms(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   int *dlist;
diff --git a/src/delete_bonds.h b/src/delete_bonds.h
index 6146104161..aff891e1ca 100644
--- a/src/delete_bonds.h
+++ b/src/delete_bonds.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class DeleteBonds : public Command {
  public:
   DeleteBonds(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/deprecated.h b/src/deprecated.h
index b06599edf4..609d0f9326 100644
--- a/src/deprecated.h
+++ b/src/deprecated.h
@@ -33,7 +33,7 @@ namespace LAMMPS_NS {
 class Deprecated : public Command {
  public:
   Deprecated(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/displace_atoms.h b/src/displace_atoms.h
index e1a0947125..3d04262a73 100644
--- a/src/displace_atoms.h
+++ b/src/displace_atoms.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class DisplaceAtoms : public Command {
  public:
   DisplaceAtoms(class LAMMPS *);
-  ~DisplaceAtoms();
-  void command(int, char **);
+  ~DisplaceAtoms() override;
+  void command(int, char **) override;
 
  private:
   int igroup, groupbit;
diff --git a/src/info.h b/src/info.h
index c1e10a2336..8c2ebb1167 100644
--- a/src/info.h
+++ b/src/info.h
@@ -29,7 +29,7 @@ namespace LAMMPS_NS {
 class Info : public Command {
  public:
   Info(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 
   bool is_active(const char *, const char *);
   bool is_defined(const char *, const char *);
diff --git a/src/minimize.h b/src/minimize.h
index f1dc539388..8fa1e6170b 100644
--- a/src/minimize.h
+++ b/src/minimize.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class Minimize : public Command {
  public:
   Minimize(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/read_data.h b/src/read_data.h
index 090e70484b..2466f2df19 100644
--- a/src/read_data.h
+++ b/src/read_data.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class ReadData : public Command {
  public:
   ReadData(class LAMMPS *);
-  ~ReadData();
-  void command(int, char **);
+  ~ReadData() override;
+  void command(int, char **) override;
   static bool is_data_section(const std::string &);
 
  private:
diff --git a/src/read_dump.h b/src/read_dump.h
index 92e5e69c47..21c9f8d862 100644
--- a/src/read_dump.h
+++ b/src/read_dump.h
@@ -29,8 +29,8 @@ namespace LAMMPS_NS {
 class ReadDump : public Command {
  public:
   ReadDump(class LAMMPS *);
-  ~ReadDump();
-  void command(int, char **);
+  ~ReadDump() override;
+  void command(int, char **) override;
 
   void store_files(int, char **);
   void setup_reader(int, char **);
diff --git a/src/read_restart.h b/src/read_restart.h
index 9de52a5f28..88b8709744 100644
--- a/src/read_restart.h
+++ b/src/read_restart.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class ReadRestart : public Command {
  public:
   ReadRestart(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   int me, nprocs;
diff --git a/src/replicate.h b/src/replicate.h
index 48abd7b4be..9eaae1d763 100644
--- a/src/replicate.h
+++ b/src/replicate.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class Replicate : public Command {
  public:
   Replicate(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/rerun.h b/src/rerun.h
index 272df6bb0a..a3474a1827 100644
--- a/src/rerun.h
+++ b/src/rerun.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class Rerun : public Command {
  public:
   Rerun(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/reset_atom_ids.h b/src/reset_atom_ids.h
index b62dc25b77..abb20bae4f 100644
--- a/src/reset_atom_ids.h
+++ b/src/reset_atom_ids.h
@@ -43,7 +43,7 @@ class ResetIDs : public Command {
 #endif
 
   ResetIDs(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   bigint binlo, binhi;
diff --git a/src/reset_mol_ids.h b/src/reset_mol_ids.h
index 6fff49bb72..787edfc4f6 100644
--- a/src/reset_mol_ids.h
+++ b/src/reset_mol_ids.h
@@ -27,8 +27,8 @@ namespace LAMMPS_NS {
 class ResetMolIDs : public Command {
  public:
   ResetMolIDs(class LAMMPS *);
-  ~ResetMolIDs();
-  void command(int, char **);
+  ~ResetMolIDs() override;
+  void command(int, char **) override;
   void create_computes(char *, char *);
   void reset();
 
diff --git a/src/run.h b/src/run.h
index 55af0cf6a0..6b0df49fff 100644
--- a/src/run.h
+++ b/src/run.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class Run : public Command {
  public:
   Run(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/set.h b/src/set.h
index f3ccefbd9d..8831ad131c 100644
--- a/src/set.h
+++ b/src/set.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class Set : public Command {
  public:
   Set(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 
  private:
   char *id;
diff --git a/src/velocity.h b/src/velocity.h
index cce8508021..2f27cd9152 100644
--- a/src/velocity.h
+++ b/src/velocity.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class Velocity : public Command {
  public:
   Velocity(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
   void init_external(const char *);
   void options(int, char **);
   void create(double, int);
diff --git a/src/write_coeff.h b/src/write_coeff.h
index d6a447080f..5381a9fe0b 100644
--- a/src/write_coeff.h
+++ b/src/write_coeff.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class WriteCoeff : public Command {
  public:
   WriteCoeff(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/write_data.h b/src/write_data.h
index d62f048894..023d270b43 100644
--- a/src/write_data.h
+++ b/src/write_data.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class WriteData : public Command {
  public:
   WriteData(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
   void write(const std::string &);
 
  private:
diff --git a/src/write_dump.h b/src/write_dump.h
index bea5660a29..c2e75b2484 100644
--- a/src/write_dump.h
+++ b/src/write_dump.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class WriteDump : public Command {
  public:
   WriteDump(class LAMMPS *lmp) : Command(lmp){};
-  void command(int, char **);
+  void command(int, char **) override;
 };
 
 }    // namespace LAMMPS_NS
diff --git a/src/write_restart.h b/src/write_restart.h
index 54d90405b2..a01d61863c 100644
--- a/src/write_restart.h
+++ b/src/write_restart.h
@@ -27,7 +27,7 @@ namespace LAMMPS_NS {
 class WriteRestart : public Command {
  public:
   WriteRestart(class LAMMPS *);
-  void command(int, char **);
+  void command(int, char **) override;
   void multiproc_options(int, int, int, char **);
   void write(const std::string &);