Real time simulation

variable t equal step*dt #now
than you can do anything with t
e.g.
thermo_style custom step atoms cpu spcpu v_t #print step, no. of atoms, simtime, steps/sec and realtime to screen
or
fix log all print 100 "${t},${fx},${fy},${fz},${Mx},${My},${Mz}" file post/forces.csv title "t,Fx,Fy,Fz,Mx,My,Mz" screen no #write time and forces on mesh to a file every 100 steps