wget -qO- 127.0.0.1 是什么意思？

Question

我已经尝试在谷歌上搜索一个小时的答案，但仍然没有运气。有谁知道这个命令是什么意思？

wget -qO- 127.0.0.1

我知道wget是 Linux 的“web get”实用程序，并且127.0.0.1是本地主机。我不知道什么-qO-意思？

我也相信上面的内容wget -q -O 127.0.0.1与终端中的简单运行不同给了我不同的结果。

注意：我试图从这个Vagrant - Getting Started Tutorial理解这个命令。

提前谢谢了。

Answer 1

您的搜索 foo 不完整。Try man wget，部分说明：

   -O file
   --output-document=file
       The documents will not be written to the appropriate files, but all will be concatenated together and written to file.  If - is used as
       file, documents will be printed to standard output, disabling link conversion.  (Use ./- to print to a file literally named -.)

       Use of -O is not intended to mean simply "use the name file instead of the one in the URL;" rather, it is analogous to shell
       redirection: wget -O file http://foo is intended to work like wget -O - http://foo > file; file will be truncated immediately, and all
       downloaded content will be written there.

       For this reason, -N (for timestamp-checking) is not supported in combination with -O: since file is always newly created, it will
       always have a very new timestamp. A warning will be issued if this combination is used.

       Similarly, using -r or -p with -O may not work as you expect: Wget won't just download the first file to file and then download the
       rest to their normal names: all downloaded content will be placed in file. This was disabled in version 1.11, but has been reinstated
       (with a warning) in 1.11.2, as there are some cases where this behavior can actually have some use.

       Note that a combination with -k is only permitted when downloading a single document, as in that case it will just convert all relative
       URIs to external ones; -k makes no sense for multiple URIs when they're all being downloaded to a single file; -k can be used only when
       the output is a regular file.

和

   -q
   --quiet
       Turn off Wget's output.

Answer 2

对于此类问题，如果您附近有浏览器，您可能会发现使用explainshell.com很方便（因为手册页可能需要很长时间才能找到您感兴趣的参数）：