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executable? 

        # File::Stat.executable?

(from ruby core)
### Implementation from Stat
---
    stat.executable?    -> true or false

---

Returns `true` if *stat* is executable or if the operating system
doesn't distinguish executable files from nonexecutable files. The tests
are made using the effective owner of the process.

    File.stat("testfile").executable?   #=> false

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