+* systemctl status $PID, systemctl stop $PID!
+
+* timeout waiting for mount devices?
+
+* default logic for serial getty, ck logging, ssh readahead
+
+* place /etc/inittab with explaining blurb.
+
+* OnFailure=foo.unit
+
+* default.target must be %ghosted...
+
+* In command lines, support both "$FOO" and $FOO