相关疑难解决方法(0)

我有一堆系统命令,它们与将新内容附加到文件有点类似.我编写了一个简单的脚本来执行系统命令,如果有单个单词如'ls','date'等,它会很好用.但是如果命令大于那个,程序就会死掉.

以下是代码

package main

import (
    "fmt"
    "os/exec"
    "sync"
)

func exe_cmd(cmd string, wg *sync.WaitGroup) {
    fmt.Println(cmd)
    c = cmd.Str
    out, err := exec.Command(cmd).Output()
    if err != nil {
        fmt.Println("error occured")
        fmt.Printf("%s", err)
    }
    fmt.Printf("%s", out)
    wg.Done()
}

func main() {
    wg := new(sync.WaitGroup)
    wg.Add(3)

    x := []string{"echo newline >> foo.o", "echo newline >> f1.o", "echo newline >> f2.o"}
    go exe_cmd(x[0], wg)
    go exe_cmd(x[1], wg)
    go exe_cmd(x[2], wg)

    wg.Wait()
}

以下是我看到的错误

exec: "echo newline >> foo.o": executable file not found …

我正在使用cmd.go(见下文)执行docker命令但它失败了.我执行以下步骤来执行并获得以下错误.

go build
sudo ./cmd

输出:

docker run -v ~/exp/a.out:/a.out ubuntu:14.04 /a.out -m 10m
2014/10/16 14:32:12 exit status 1

另一方面直接运行为

sudo docker run -v ~/exp/a.out:/a.out ubuntu:14.04 /a.out -m 10m

得到a.out的正确输出.

Hello World

这是cmd.go的代码.我怎样才能让它发挥作用？谢谢!

package main

import (
        "fmt"
        "log"
        "os/exec"
        "strings"
)

func ExampleCmd_Output() {
        //out, err := exec.Command("date", "--version").Output()   // This works
        //out, err := exec.Command("docker", "--version").Output() // This works
        //out, err := exec.Command(cmd, "images").Output() // Even docker images command works!

        cmd := "docker"
        cmdArgs := []string{"run", "-v", "~/exp/a.out:/a.out", …