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$ ghdl -r [options] primary_unit [secondary_unit] [simulation_options]
The options and arguments are the same as for the elaboration command, see Elaboration command.
On GNU/Linux this command simply determines the filename of the executable and executes it. Options are ignored. You may also directly execute the program.
This command exists for three reasons:
On Windows this command elaborates and launches the simulation. As a consequence you must use the same options used during analysis.
See Simulation and runtime, for details on options.