A very primitive wget in Go

wget.go

package main

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

func main() {
	url, filename := os.Args[1], os.Args[2]
	resp, err := http.Get(url)
	check(err, fmt.Sprintf("Error: %v\n", url, err), 1)
	body, err := ioutil.ReadAll(resp.Body)
	resp.Body.Close()
	check(err, fmt.Sprintf("Error fetching %q: %v\n", url, err), 1);
	err = ioutil.WriteFile(filename, body, 0644)
	check(err, fmt.Sprintf("Error writing '%q': %v", filename, err), 1);
}

func check(err error, msg string, exitCode int) {
	if err != nil {
		fmt.Fprintf(os.Stderr, msg)
		os.Exit(exitCode)
	}
}