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sync 

        # IO.sync

(from ruby core)
---
    sync -> true or false

---

Returns the current sync mode of the stream. When sync mode is true, all
output is immediately flushed to the underlying operating system and is
not buffered by Ruby internally. See also #fsync.

    f = File.open('t.tmp', 'w')
    f.sync # => false
    f.sync = true
    f.sync # => true

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