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os: add example for OpenFile
New beginners are not familiar with open(2)-style masking of the flags. Add an example demonstrates the flag or'ing. Change-Id: Ifa8009c55173ba0dc6642c1d3b3124c766b1ebbb Reviewed-on: https://go-review.googlesource.com/27996 Reviewed-by: Brad Fitzpatrick <[email protected]>
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‎src/os/example_test.go‎

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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os_test
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import (
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"log"
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"os"
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)
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func ExampleOpenFile() {
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f, err := os.OpenFile("notes.txt", os.O_RDWR|os.O_CREATE, 0755)
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if err != nil {
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log.Fatal(err)
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}
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if err := f.Close(); err != nil {
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log.Fatal(err)
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}
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}

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