dongxue9997
2018-11-01 11:31
浏览 761

在go中使用curl和命令

I'm using Go with command to execute curl which works as expected

curl := exec.Command("curl", "https://services.odata.org/V3/northwind/northwind.svc/")
    out, err := curl.Output()
    if err != nil {
        fmt.Println("erorr" , err)
        return
    }
    fmt.Println(out)

Now I want to use some placeholders like

curl -O http://quiet-waters-1228.herokuapp.com/assets/image.jpg

but now I need to get the url for command e.g. if I run in bash mytool url I got the url value

`curl -O $(mytool url)`

The problem is that we need to execute the command in the code and I'm not sure how to pass it

curl := exec.Command("curl", "curl -O $(url)")
        out, err := curl.Output()
        if err != nil {
            fmt.Println("erorr" , err)
            return
        }
        fmt.Println(out)

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我正在使用Go with命令来执行 curl ,它可以按预期工作

  curl:= exec.Command(“ curl”,“ https://services.odata.org/V3/northwind/northwind.svc/")
 out,错误:=  curl.Output()
如果错误!= nil {
 fmt.Println(“ erorr”,err)
 return 
} 
 fmt.Println(out)
   \  n 
 

现在我要使用一些占位符,例如

  curl -O http://quiet-waters-1228.herokuapp.com/assets/image.jpg  
   
 
 

,但现在我需要获取命令的网址 e.g。 如果我在bash中运行 mytool url ,我得到了url值

 `curl -O $(mytool url)`
  <  / pre> 
 
 

问题是我们需要在代码中执行命令,但我不确定如何传递它

  curl:=  exec.Command(“ curl”,“ curl -O $(url)”)
 out,err:= curl.Output()
如果err!= nil {
 fmt.Println(“ erorr”,err)  
 return 
} 
 fmt.Println(out)
   
 
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1条回答 默认 最新

  • dqz84361326 2018-11-01 11:36
    已采纳

    In os package you have slice of strings which contains all arguments passed by shell to your program.

    os.Args 0th value, i.e., first element is going to be name of the command itself.

    If your tool command is mytool, os.Args[0] contains mytool.

    Rest are going to be the arguments, which are passed by shell.

    package main
    
    import (
        "log"
        "os"
        "os/exec"
    )
    
    func main() {
    
        if len(os.Args) < 2 {
            // If argument is not provided quit
            log.Fatalln("url not provided")
        }
        url := os.Args[1] // URL
    
        cmd := exec.Command("curl", "-O", url)
        cmd.Run()
    }
    

    You can also download multiple URLs concurrently,

    var wg *sync.WaitGroup
    
    func main() {
        urls := os.Args[1:]
    
        wg = new(sync.WaitGroup)
        wg.Add(len(urls))
    
        for _, url := range urls {
            go download(url)
        }
    
        wg.Wait()
    }
    
    func download(url string) {
        defer wg.Done()
        cmd := exec.Command("curl", "-O", url)
        cmd.Run()
    }
    
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