busybox/testsuite/hostid/hostid-works

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h=x$(busybox hostid)
# Is $h a sequence of hex numbers?
x="${h//[0123456789abcdef]/x}"
x="${x//xxx/x}"
x="${x//xxx/x}"
x="${x//xxx/x}"
x="${x//xx/x}"
test x"$x" = x"x"