Code review needed for Step 1 and 2

[Patg13]

Because of the upgrade to Ubuntu 20.04, the parallel command block is now outside the scope of the main loop, to stop the process in case of skipping, the continue instruction was replaced by a kill command targeted on the BASH_PID (different for each children).

Because of this, the concept of the exit_on_error is not applicable anymore, it must be changed for something more robust and it must also intercept a kill command (ctrl-c for exemple) and destroy all the process children before killing the main script.