Shell 如何使用Go程序中的点脚本运行graphviz进程？

我想运行输出到图像的点脚本。
从Golang怎么称呼它

package main

import (
"fmt"

"os/exec"
)

func main() {
path, err := exec.LookPath("dot")
cmd := exec.Command(path, "-Tpng", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot", ">", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/hello.png")
err = cmd.Run()

fmt.Println(path)
if err != nil {
    println(err.Error())
    return
}
}

path, _ := exec.LookPath("dot")       
cmd := exec.Command(path, "-Tpng", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot")        
out := cmd.Run()       
fmt.Println(out)         

这是我的代码，给出了退出代码3

path, _ := exec.LookPath("dot")       
cmd := exec.Command(path, "-Tpng", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot")        
out := cmd.Run()       
fmt.Println(out)         

@虫族
对不起，我可以这样做，我只是感到困惑，因为这段代码除了nil之外没有任何输出

path, _ := exec.LookPath("dot")       
cmd := exec.Command(path, "-Tpng", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot")        
out := cmd.Run()       
fmt.Println(out)         

但是这个命令行功能可以工作

path, _ := exec.LookPath("dot")       
cmd := exec.Command(path, "-Tpng", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot")        
out := cmd.Run()       
fmt.Println(out)         

dot -Tpng  /Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot           

---

您能告诉我如何在Golang中实际使用上述函数吗？

正如@zerkms之前提到的，您可以使用cmd.StdoutPipe（）而不是“>”

path, _ := exec.LookPath("dot")       
cmd := exec.Command(path, "-Tpng", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot")        
out := cmd.Run()       
fmt.Println(out)         

然而，有一个更简单的方法来解决这个问题

path, _ := exec.LookPath("dot")       
cmd := exec.Command(path, "-Tpng", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot")        
out := cmd.Run()       
fmt.Println(out)         

package main

import (
   "io/ioutil"
   "os"
   "os/exec"
)

func main() {
path, _ := exec.LookPath("dot")
cmd, _ := exec.Command(path, "-Tpng", "/Users/arafat/Desktop/dev/go/src/github.com/Arafatk/dataviz/DotExamples/arraylist.dot").Output()
mode := int(0777)
   ioutil.WriteFile("outfile.png", cmd, os.FileMode(mode))
}

---

是一种外壳功能。在您的情况下，您不能只读取

cmd.StdoutPipe（）

？什么是点脚本？@Flimzy@zerkms我的意思是，我想直接将输出写入png文件？