Pipe example in Go

pipe.go

package main

import (
	"fmt"
	"log"
	"os"
	"os/exec"
	"os/signal"
	"syscall"
	"time"
)

func main() {
	go pipeHandler()

	pager := os.Getenv("PAGER")
	cmd := exec.Command(pager)
	out, err := cmd.StdinPipe()
	if err != nil {
		log.Fatal(err)
	}
	defer out.Close()
	cmd.Stdout = os.Stdout
	if err := cmd.Start(); err != nil {
		log.Fatal(err)
	}

	for {
		fmt.Fprintln(out, time.Now())
	}
}

func pipeHandler() {
	signals := make(chan os.Signal, 1)
	signal.Notify(signals, syscall.SIGCHLD)
	defer signal.Stop(signals)

	for range signals {
		os.Exit(0)
	}
}