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main.go

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package main

import (

"fmt"

"os"

"io/ioutil"

)

func main() {

filename := ""

if len(os.Args) > 1 {

filename = os.Args[1]

}

str := `

package main

import (

"fmt"

)

func main() {

fmt.Println("Hello world!");

}

`

if filename == "" {

fmt.Println(str)

} else {

err := ioutil.WriteFile(filename, []byte(str), 0644)

if err != nil {

panic(err)

}

}

}