在前面的例子中，我们看看产生外部进程。 当需要一个运行的Go进程可访问的外部进程时，我们就可以这样做。有时只是想用另一个(可能是非Go)完全替换当前的Go进程。可使用Go的经典exec函数来实现。
在下面的例子将执行ls命令。 Go需要一个我们想要执行的二进制的绝对路径，所以将使用exec.LookPath来找到它(可能是/bin/ls)。

所有的示例代码，都放在 F:\worksp\golang 目录下。安装Go编程环境请参考：http://www.yiibai.com/go/go_environment.html

execing-processes.go的完整代码如下所示 -

package main

import "syscall"
import "os"
import "os/exec"

func main() {

    // For our example we'll exec `ls`. Go requires an
    // absolute path to the binary we want to execute, so
    // we'll use `exec.LookPath` to find it (probably
    // `/bin/ls`).
    binary, lookErr := exec.LookPath("ls")
    if lookErr != nil {
        panic(lookErr)
    }

    // `Exec` requires arguments in slice form (as
    // apposed to one big string). We'll give `ls` a few
    // common arguments. Note that the first argument should
    // be the program name.
    args := []string{"ls", "-a", "-l", "-h"}

    // `Exec` also needs a set of [environment variables](environment-variables)
    // to use. Here we just provide our current
    // environment.
    env := os.Environ()

    // Here's the actual `syscall.Exec` call. If this call is
    // successful, the execution of our process will end
    // here and be replaced by the `/bin/ls -a -l -h`
    // process. If there is an error we'll get a return
    // value.
    execErr := syscall.Exec(binary, args, env)
    if execErr != nil {
        panic(execErr)
    }
}

执行上面代码，将得到以下输出结果 -

此程序仅限在 Linux 类系统上执行。

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