unit name, plus a control group specification in the syntax
<replaceable>CONTROLLER</replaceable>:<replaceable>PATH</replaceable>
or <replaceable>CONTROLLER</replaceable>. In the latter syntax
- (where the path is ommitted) the default unit control group
+ (where the path is omitted) the default unit control group
path is implied. Examples: <literal>cpu</literal> or
<literal>cpu:/foo/bar</literal>. If a unit is removed from a
control group hierarchy all its processes will be moved to the