I have made a simplified version of it by using running Lynx and using files pre-configured in advance.Īdd the following line to /etc/lynx-cur/lynx.cfg (or wherever your lynx.cfg resides): PRINTER:P:printenv LYNX_PRINT_TITLE>/home/account/title.txt:TRUE:1000 I liked the idea of Stéphane Chazelas to use Lynx and LYNX_PRINT_TITLE, but that script didn't work for me under Ubuntu 14.04.5.
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$tree = HTML::TreeBuilder::XPath->new_from_url($ARGV) You can also do something similar with Perl and the HTML::TreeBuilder::XPath module. For each found we want to return its content ( e.content). The method xpath then looks for nodes (tags) in the HTML that are leaf nodes, ( //) with the name title. The above is parsing the data that comes via the curl as HTML ( Nokogiri::HTML). 'puts Nokogiri::HTML(readlines.join).xpath("//title").map '
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It's available in Ruby as a Gem and can be used like so: $ curl '' -so - | \ If that occurs then you'll likely want to use a real HTML/XML parser. A real HTML/XML Parser - using RubyĪt some point regex will fail in solving this type of problem. The above finds the case insensitive string lang= followed by a word sequence ( \w+). The tool sed can be used to do this: $ curl '' -so - | \ If the is set like this, then you'll need to remove this prior to greping it. You can mitigate this situation by using tr, to delete any \n characters, i.e. spans multiple lines, then the above won't find it. (?=) = look for a string that ends with this to the right of it.(?) = look for a string that starts with this to the left of it.-o = Return only the portion that matches.You'll need to enlist the use of PCRE (Perl Compatible Regular Expressions) in grep to get the look behind and look ahead facilities so that we can find the. You can also use curl and grep to do this. While using regexps to parse HTML is often frowned upon, here is a typical case where it's good enough for the task (IMO). For instance, to cover all the cases (for instance, a web page that has some javascript pulled from a 3rd party site that sets the title or redirect to another page in an onload hook), you may have to implement a real life browser with its dom and javascript engines that may have to do hundreds of queries for a single HTML page, some of which trying to exploit vulnerabilities. You may also want to take into consideration performance, security.
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That is, you need something to do the HTTP request with the proper parameters, intepret the HTTP response correctly, fully interpret the HTML code as a browser would, and return the title.Īs I don't think that can be done on the command line with the browsers I know (though see now this trick with lynx), you have to resort to heuristics and approximations, and the one above is as good as any. Ideally, what you need here, is a real web browser to give you the information. It should also be noted that this solution won't work at all for UTF-16 or UTF-32 encoded pages. Perl -l -0777 -ne 'print $1 if /\s*(.*?)\s*\s*(.*?)\s*\s*(.*?)\s*<\/title/si'īut if you want to cover for other charsets, once again, it would have to be taken care of.
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There may still be some HTML encoding: $ wget -qO- '' |
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Normally, there should not be any HTML tags in there, there may possibly be comments (though not handled by some browsers like firefox so very unlikely). That solution outputs the raw text between and. (incorrect html, but still found out there and supported by most browsers) interpretation of the code inside the tags. However, HTML is not required to be valid XML (older versions of the language were not), and because most browsers out there are lenient and will accept incorrect HTML code, there's even a lot of incorrect HTML code out there.īoth my solution and coffeeMug's will fail for a variety of corner cases, sometimes the same, sometimes not. It is more correct if the page is guaranteed to be valid XML. That way, awk stops reading after the first and tag, but there are cases where it won't work.īy contrast coffeeMug's solution will parse the HTML page as XML and return the corresponding value for title. A better approach, if GNU awk is available on your system could be: wget -qO- '' | Given that the title is found in the section that is in the first few bytes of the file, that's not optimal. Here, out of laziness, we have perl read the whole content in memory before starting to look for the tag.