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setuid?

        # File::Stat.setuid?

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

---

Returns `true` if *stat* has the set-user-id permission bit set, `false`
if it doesn't or if the operating system doesn't support this feature.

    File.stat("/bin/su").setuid?   #=> true



      

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.