问题描述
我想知道是否有一种方法提前检查可以通过 wget 下载的文件大小？我知道，使用 - spider 选项告诉我一个文件是否存在，但我也有兴趣找到该文件的大小。
I'm wondering if there is a way to check ahead of time the size of a file I might download via wget? I know that using the --spider option tells me if a file exists or not, but I'm interested in finding the size of that file as well.
推荐答案
对我来说 - spider 会显示大小：
$ wget --spider http://henning.makholm.net/
Spider mode enabled. Check if remote file exists.
--2011-08-08 19:39:48-- http://henning.makholm.net/
Resolving henning.makholm.net (henning.makholm.net)... 85.81.19.235
Connecting to henning.makholm.net (henning.makholm.net)|85.81.19.235|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 9535 (9.3K) [text/html] <-------------------------
Remote file exists and could contain further links,
but recursion is disabled -- not retrieving.
$
（但请注意，并非所有网络服务器都会通知客户数据的长度，除非通过在所有连接被发送时关闭连接）。
(But beware that not all web servers will inform clients of the length of the data except by closing the the connection when it's all been sent).
如果你担心wget会改变格式，报告长度，可以使用 wget --spider --server-response 并在输出中查找 Content-Length 标题。
If you're concerned about wget changing the format it reports the length in, you might use wget --spider --server-response and look for a Content-Length header in the output.
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