thanks all, I use ide go to definition, it go to the file_unix.go
in this file seek is a private method.
So I am confused
在 2017年1月19日星期四 UTC+8下午2:45:16，Konstantin Khomoutov写道：
>
> On Wed, 18 Jan 2017 22:22:48 -0800 (PST)
> hui zhang <fastf...@gmail.com <javascript:>> wrote:
>
> [...]
> > fi, err := os.Open("./output.bin")
> [...]
> > fi.seek()////?????
>
> The usual drill is:
>
> 1. Get the documentation on os.Open():
>
> $ go doc os.Open
>
> Notice what it returns in its 1st return value has the
> type *File. Since it has no "pkg." qualifier it means
> that name is defined in the same package.
>
> 2. So we now read the docs on os.File:
>
> $ go doc os.File
>
> ...and see all of its methods there, inclusing Seek().
>
> 3. So we read the docs on it:
>
> $ go doc os.File.Seek
>
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