adb wait-for-device和adb wait-for-devices之间有什么区别吗？

问题描述：

我使用了两个命令来等待设备启动：
adb wait-for-device和adb wait-for-devices。
两者似乎都在等待设备启动，我发现它们的行为没有任何区别。他们的行为有什么区别吗？

添加有关我所做操作的更多信息：

所以这是我在android上所做的文档我使用adb等待设备，但是有时在使用此命令时，我将其用作adb等待设备，如您所见，我在末尾添加了一个额外的's'，但该命令仍然有效。所以我在想为什么等待设备和等待设备都起作用！ android为什么要提供两个相同的命令？

There are two commands that I used wait for a device to come up: adb wait-for-device and adb wait-for-devices. Both seem to wait for a device to boot up, I din't find any difference in their behaviour. Is there any difference in their behaviour?

Adding more information on what I did:

So here is what I did, from the android documentation I used adb wait-for-device but then sometime while using this command I used it as adb wait-for-devices, as you can see I added a extra 's' at the end, but the command still worked. So I was thinking why does both wait-for-device and wait-for-devices work! Why would android provide two commands for the same?

答

这就是 adb 处理命令：

 /* handle wait-for-* prefix */
if (!strncmp(argv[0], "wait-for-", strlen("wait-for-"))) {
    const char* service = argv[0];
    if (!strncmp(service, "wait-for-device", strlen("wait-for-device"))) {
        if (ttype == kTransportUsb) {
            service = "wait-for-usb";
        } else if (ttype == kTransportLocal) {
            service = "wait-for-local";
        } else {
            service = "wait-for-any";
        }
    }

因此任何以开头的字符串等待设备将具有相同的效果

So any string starting with wait-for-device would have the same effect

adb wait-for-device和adb wait-for-devices之间有什么区别吗？

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