http://developer.apple.com/jp/qa/qa2001/qa1134.html
How do I programmatically shutdown, restart, sleep or logout a machine running Mac OS X?
printf(“1: Restart computer\n”);
printf(“2: Shutdown computer\n”);
printf(“3: Logout computer\n”);
printf(“4: Sleep computer\n”);
printf(“q: quit program\n”);
今後使いそうなのでメモしておこう。