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===== os.Open =====

==== What is it? ====
`os.Open(name)` opens the named file for reading and returns an `*os.File`.

==== What is it used for? ====
  * Read file contents.
  * Work with file handles for streaming reads.

==== Example ====
<code go>
f, err := os.Open("data.txt")
if err != nil {
    return err
}
defer f.Close()

b, err := io.ReadAll(f)
if err != nil {
    return err
}
_ = b
</code>

==== Notes ====
  * Always `defer f.Close()` to release resources.
  * For read+write or create, use `os.OpenFile` with flags.
  * For small files, `os.ReadFile` is a convenient helper.

==== Related pages ====
  * [[go:stdlib:os_readfile|os.ReadFile]]
  * [[go:stdlib:os_openfile|os.OpenFile]]
  * [[go:stdlib:os_create|os.Create]]

==== Hard words (English) ====
  * **handle** /ˈhændl/: tay cầm file (descriptor)
  * **streaming** /ˈstriːmɪŋ/: đọc theo luồng (từng phần)
  * **release** /rɪˈliːs/: giải phóng
  * **flag** /flæɡ/: cờ tuỳ chọn