bash curl 编译重定向页面列表
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curl to compile a list of redirected pages
提问by Vlueboy
Suppose I have a bash script that goes through a file that contains a list of old URLs that have all been redirected.
假设我有一个 bash 脚本，它遍历一个文件，该文件包含已全部重定向的旧 URL 列表。
curl --location http://destination.comwill process a page by following a redirect. However, I'm interested not in the content, but on where the redirect points so that I can update my records.
curl --location http://destination.com将通过重定向处理页面。但是，我对内容不感兴趣，而对重定向指向的位置感兴趣，以便我可以更新我的记录。
What is the command-line option for curl to output what that new location for the URL is?
curl 输出 URL 的新位置的命令行选项是什么？
回答by chown
You wou want to leave out the --location/-Lflag, and use -w, checking the redirect_urlvariable. curl -w "%{redirect_url}" http://someurl.comshould do it.
您想省略--location/-L标志，并使用-w，检查redirect_url变量。 curl -w "%{redirect_url}" http://someurl.com应该这样做。
Used in a script:
在脚本中使用：
REDIRECT=`curl -w "%{redirect_url}" http://someurl.com`
echo "http://someurl.com redirects to: ${REDIRECT}"
From the curl man page:
从curl 手册页：
-w, --write-out <format>Make curl display information on stdout after a completed transfer. The format is a string that may contain plain text mixed with any number of variables. The format can be specified as a literal "string", or you can have curl read the format from a file with "@filename" and to tell curl to read the format from stdin you write "@-".
The variables present in the output format will be substituted by the value or text that curl thinks fit, as described below. All variables are specified as %{variable_name} and to output a normal % you just write them as %%. You can output a newline by using \n, a carriage return with \r and a tab space with \t.
NOTE:The %-symbol is a special symbol in the win32-environment, where all occurrences of % must be doubled when using this option.
The variables available are:
...
redirect_urlWhen an HTTP request was made without -L to follow redirects, this variable will show the actual URL a redirect wouldtake you to. (Added in 7.18.2)
...
-w, --write-out <format>完成传输后，使 curl 在 stdout 上显示信息。格式是一个字符串，可以包含与任意数量的变量混合的纯文本。格式可以指定为文字“字符串”，或者您可以让 curl 从带有“@filename”的文件中读取格式，并告诉 curl 从您写入的 stdin 中读取格式“@-”。
输出格式中存在的变量将被 curl 认为合适的值或文本替换，如下所述。所有变量都指定为 %{variable_name} 并且要输出正常的 % 您只需将它们写为 %%。您可以使用 \n 输出换行符，使用 \r 输出回车符，使用 \t 输出制表符空间。
注意：%-symbol 是 win32-environment 中的特殊符号，使用此选项时，所有出现的 % 都必须加倍。
可用的变量有：
...
redirect_url当 HTTP 请求没有 -L 跟随重定向时，此变量将显示重定向将带您到的实际 URL 。（在 7.18.2 中添加）
...
回答by ajreal
This might work (as a starting point)
这可能有效（作为起点）
curl -sI google.com | head -1 | grep 301 | wc -l
回答by Kent
man curl
then
然后
search redirect_url
redirect_urlWhen a HTTP request was made without -L to follow redirects, this variable will show the actual URL a redirect would take you to. (Added in 7.18.2)
redirect_url当一个没有 -L 的 HTTP 请求跟随重定向时，这个变量将显示重定向将带你到的实际 URL。（在 7.18.2 中添加）
the variable above is for -w/--write-out <format>
上面的变量是为了 -w/--write-out <format>
