如何将go程序在终端中的输出通过管道传输到另一个程序？

Question

I want to run grep on the output produced by a go program. With other languages, I can easily do it. e.g.: java Test | grep world

Even redirecting the output to a file doesn't seem to work and the file created is empty and the terminal still prints the output.

package main
func main() {
  println("One")
  println("Hello")
}

Expected:

go build test.go
./test | grep 'e'
Hello

Actual:

go build test.go
./test | grep 'e'
One
Hello

Answer 1

I figured out my mistake.

From println documentation:

The println built-in function formats its arguments in an implementation-specific way and writes the result to standard error.

So, it doesn't output on stdout. For printing to stdout, fmt.Println can be used instead.