wget -O 是什么意思 -

Question

我正在尝试将 dropbox 安装到我的 Debian 机器上，我看到了说明

cd ~ && wget -O - "some website leading to the download of a tar file" | tar xzf - 

但我所做的只是输入：

wget -O - "some website leading to the download of a tar file"

我的终端上有很多垃圾。是什么 wget -O -意思？它对我的电脑有什么危害吗？

Answer 1

查看wget.

-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.

因此，您可以使用将“URL”的内容下载到文件中-O somefile，也可以下载它并通过 STDOUT 将其内容重定向到另一个工具以对其进行处理。在这种情况下，这就是他们对| tar xvf -.

你的命令：

$ cd ~ && wget -O - "some website leading to the download of a tar file" | tar xzf -

上面是从“URL”中获取 tarball，当它被下载时，它被重定向到命令，tar以便它可以解压缩到你的文件系统中。