英文:
Pinging from cmd
问题
我有一个应用程序，需要ping google.com来检查网络连接是否正常。
以下代码可以正常工作并列出目录内容：
cmd := exec.Command("ls", "-lah")
var stdout, stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
log.Fatalf("cmd.Run() failed with %s\n", err)
}
outStr, errStr := string(stdout.Bytes()), string(stderr.Bytes())
fmt.Printf("out:\n%s\nerr:\n%s\n", outStr, errStr)
当我更改参数时，它会卡住：
cmd := exec.Command("ping", "goole.com")
这会导致错误：cmd.Run() failed with exit status 2
cmd := exec.Command("ping", "https://www.goole.com")
当我将参数更改为：
cmd := exec.Command("ping -c 5", "goole.com")
我得到了以下错误信息：
cmd.Run() failed with exec: "ping -c 5": executable file not found in $PATH
我在使用go mod来管理我的依赖项。你有什么想法，我做错了什么？
英文:
I have this app that needs to ping google.com to see if the network connection is alive.
The following works code fine and lists the directory content:
cmd = exec.Command("ls", "-lah")
var stdout, stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err = cmd.Run()
if err != nil {
log.Fatalf("cmd.Run() failed with %s\n", err)
}
outStr, errStr := string(stdout.Bytes()), string(stderr.Bytes())
fmt.Printf("out:\n%s\nerr:\n%s\n", outStr, errStr)
When I change the args this hangs.
cmd = exec.Command("ping", "goole.com")
This causes an error: cmd.Run() failed with exit status 2
cmd = exec.Command("ping", "https://www.goole.com")
After i changed the args to:
cmd = exec.Command("ping -c 5", "goole.com")
I get
> cmd.Run() failed with exec: "ping -c 5": executable file not found in
> $PATH
I'm using go mod for my dependencies.
Any idea what I do wrong?
答案1
得分: 4
- 出错是因为你提到了
https。尝试使用以下方式运行：
cmd = exec.Command("ping", "www.google.com") 或者简单地使用 "google.com" 也可以。
- 第一个卡住的原因是因为你在调用
ping时没有添加其他参数，这会导致无限运行ping命令。所以尝试使用参数-c来指定ping的次数。
这样应该可以解决问题。
cmd := exec.Command("ping", "-c", "3", "google.com")
更好的做法是使用较小的间隔 -i 0.1 或者其他你认为合适的值来加快速度。但是请确保添加了 -c 参数。
英文:
- The error is because you mention
https. Try running as
cmd = exec.Command("ping", "www.google.com") or simply "google.com" should work too.
- The reason the first one hangs is because you're calling
pingwithout any other args which runs pings infinitely. So try calling it with args-cwhich mentions the count.
This should work.
cmd := exec.Command("ping", "-c" , "3", "google.com")
Even better, make it faster with a smaller interval -i 0.1 or something that you see fit. But ensure you add the -c.
答案2
得分: 3
ping命令运行时间很长，这就是为什么它看起来像是挂起了 - ping从不退出。你可以通过使用-c参数限制ping尝试的次数来强制它退出，例如：
ping -c 5 goole.com 将尝试5次ping。这是shell形式。在你的代码中，使用：
cmd := exec.Command("ping", "-c1", "goole.com")
https://www.goole.com 失败是因为ping期望一个主机名，而不是一个URL。
英文:
The ping command runs indefinitely, which is why it appears to hang - ping never exits. You can force it to exit by limiting the number of ping attempts with the -c argument, e.g.
ping -c 5 goole.com will attempt 5 pings. This is the shell form. In your code, use:
cmd = exec.Command("ping", "-c1", "goole.com")
https://www.goole.com fails because ping expects a host name, not a URL.
答案3
得分: 1
为什么要生成一个进程来ping一个IP地址？尝试使用go-ping，它是实现ICMP ping的几个包之一（https://pkg.go.dev/search?q=ping）。
英文:
Why would you spawn a process to ping an IP address? Try go-ping, one of several packages that implement ICMP ping.
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