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blockdev?

        # File::Stat.blockdev?

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

---

Returns `true` if the file is a block device, `false` if it isn't or if
the operating system doesn't support this feature.

    File.stat("testfile").blockdev?    #=> false
    File.stat("/dev/hda1").blockdev?   #=> true



      

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