Fetch a URL and output to stdout

fetchurl.go

package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"path"
)

func main() {
	for _, imgurl := range os.Args[1:] {
		err := fetch(imgurl, os.Stdout)
		if err != nil {
			exit(err)
		}
	}
}

func fetch(url string, out io.Writer) error {
	resp, err := http.Get(url)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	io.Copy(out, resp.Body)
	return nil
}

func exit(err error) {
	fmt.Fprintf(os.Stderr, "%s: %s\n", path.Base(os.Args[0]), err)
	os.Exit(1)
}