Yes, it is written systemd, not system D or System D, or even SystemD. And it isn't system d either. Why? Because it's a system daemon, and under Unix/Linux those are in lower case, and get suffixed with a lower case d. And since systemd manages the system, it's called systemd. It's that simple.
[^] # Re: systemd vs upstart
Posté par spider-mario . En réponse à la dépêche Ubuntu 12.04 Precise Pangolin est sortie. Évalué à 9.
http://www.freedesktop.org/wiki/Software/systemd#line-17