为什么Go自带的日志默认输出到os.Stderr？ - 知乎 https://www.zhihu.com/question/67629357

 Note that the Go runtime writes to standard error for panics and crashes; closing Stderr may cause those messages to go elsewhere, perhaps to a file opened later.

os - The Go Programming Language https://golang.org/pkg/os/

Variables

Portable analogs of some common system call errors.

Errors returned from this package may be tested against these errors with errors.Is.

var (
    // ErrInvalid indicates an invalid argument.
    // Methods on File will return this error when the receiver is nil.
    

Stdin, Stdout, and Stderr are open Files pointing to the standard input, standard output, and standard error file descriptors.

Note that the Go runtime writes to standard error for panics and crashes; closing Stderr may cause those messages to go elsewhere, perhaps to a file opened later.

var (
    

Args hold the command-line arguments, starting with the program name.

var string

proposal: os: Stdin, Stdout and Stderr should be interfaces · Issue #13473 · golang/go https://github.com/golang/go/issues/13473

Replacing os.Stdout/os.Stderr should redirect panic · Issue #325 · golang/go https://github.com/golang/go/issues/325

Capture os.Stdout and/or os.Stderr in Go

go-capturer/main.go at master · zenizh/go-capturer https://github.com/zenizh/go-capturer/blob/master/main.go