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seek 

        # IO.seek

(from ruby core)
---
    seek(offset, whence = IO::SEEK_SET) -> 0

---

Seeks to the position given by integer `offset` (see
[Position](#class-IO-label-Position)) and constant `whence`, which is
one of:

*   `:CUR` or `IO::SEEK_CUR`: Repositions the stream to its current
    position plus the given `offset`:

        f = File.open('t.txt')
        f.tell            # => 0
        f.seek(20, :CUR)  # => 0
        f.tell            # => 20
        f.seek(-10, :CUR) # => 0
        f.tell            # => 10

*   `:END` or `IO::SEEK_END`: Repositions the stream to its end plus the
    given `offset`:

        f = File.open('t.txt')
        f.tell            # => 0
        f.seek(0, :END)   # => 0  # Repositions to stream end.
        f.tell            # => 70
        f.seek(-20, :END) # => 0
        f.tell            # => 50
        f.seek(-40, :END) # => 0
        f.tell            # => 30

*   `:SET` or `IO:SEEK_SET`: Repositions the stream to the given
    `offset`:

        f = File.open('t.txt')
        f.tell            # => 0
        f.seek(20, :SET) # => 0
        f.tell           # => 20
        f.seek(40, :SET) # => 0
        f.tell           # => 40


Related: IO#pos=, IO#tell.

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