gistfile1.go

package main

package main

import ("flag"
       "net/http"
       "net/url"
       "os"
       "io"
       "log"
       "io/ioutil"
       )


func main(){

     flag.Parse()

     url_arg := flag.Arg(0)     

     url, err := url.Parse(url_arg)

     if err != nil {
        log.Fatal(err, "invalid url", url)
     }

     resp, err := http.Get(url_arg) 
     if err != nil {
        log.Fatal(err)
        os.Exit(1)
     }
     
     defer resp.Body.Close()
     
     fd, err := ioutil.TempFile("/tmp", "download.tmp.")
     defer fd.Close()
     if err != nil {    
        log.Fatal(err)
        os.Exit(1)
     }

     log.Print("Writing to ", fd.Name())

     defer log.Print("Done")

     io.Copy(fd, resp.Body)

}