wget:检查文件时间戳和覆盖

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我怎样才能得到wget去做这个:

从某个位置下载文件，例如 x ，仅当文件的本地副本具有比 x 上的文件时间戳旧的时间戳时.这意味着，它应该从给定的位置下载文件，只有在有更新版本的文件时。

如果有更新版本的文件，wget应该覆盖文件。

是否有可能做到这一点？

Answer 1

听起来您正在寻找 wget 的时间戳功能:http://www.gnu.org/software/wget/manual/wget.html#Time_002dStamping

Say you would like to download a file so that it keeps its date of modification.

wget -S http://www.gnu.ai.mit.edu/ 

A simple ls -l shows that the time stamp on the local file equals the state of the Last-Modified header, as returned by the server. As you can see, the time-stamping info is preserved locally, even without ‘-N’ (at least for http).

Several days later, you would like Wget to check if the remote file has changed, and download it if it has.

wget -N http://www.gnu.ai.mit.edu/