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exitstatus 

        # Process::Status.exitstatus

(from ruby core)
### Implementation from Status
---
    stat.exitstatus   -> integer or nil

---

Returns the least significant eight bits of the return code of *stat*.
Only available if #exited? is `true`.

    fork { }           #=> 26572
    Process.wait       #=> 26572
    $?.exited?         #=> true
    $?.exitstatus      #=> 0

    fork { exit 99 }   #=> 26573
    Process.wait       #=> 26573
    $?.exited?         #=> true
    $?.exitstatus      #=> 99

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