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sysseek 

        # IO.sysseek

(from ruby core)
---
    ios.sysseek(offset, whence=IO::SEEK_SET)   -> integer

---

Seeks to a given *offset* in the stream according to the value of
*whence* (see IO#seek for values of *whence*). Returns the new offset
into the file.

    f = File.new("testfile")
    f.sysseek(-13, IO::SEEK_END)   #=> 53
    f.sysread(10)                  #=> "And so on."

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.