Well, that's clear enough, but what of the double $$ case? Would this
them make a PID unique to each invocation untill it finally wraps a 16
bit value, or will the kernel re-use them because they won't all be
running simultainiously, but limited by the number of unique 'spindle'
numbers on the system, this to prevent as best as it can, the thrashing
of a drive by having tar working on 2 separate (or more) partitions at
the same time. In my case 2 are possible, as /var is on a separate
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