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HTTrack is a free and open-source Web crawler and offline browser, developed by Xavier Roche and licensed under the GNU General Public License Version 3. HTTrack allows users to download World Wide Web sites from the Internet to a local computer. [5] [6] By default, HTTrack arranges the downloaded site by the original site's relative link ...
A Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering).
Starting on April 7, 2003, Yahoo! Search became its own web crawler-based search engine. [8] They combined the capabilities of search engine companies they had acquired and their prior research into a reinvented crawler called Yahoo!. The new search engine results were included in all of Yahoo's websites that had a web search function.
Web search engines are listed in tables below for comparison purposes. The first table lists the company behind the engine, volume and ad support and identifies the nature of the software being used as free software or proprietary software.
This is an accepted version of this page This is the latest accepted revision, reviewed on 7 February 2025. Filename used to indicate portions for web crawling. robots.txt Robots Exclusion Protocol Example of a simple robots.txt file, indicating that a user-agent called "Mallorybot" is not allowed to crawl any of the website's pages, and that other user-agents cannot crawl more than one page ...
The most widely used type of search engine is a web search engine, which searches for information on the World Wide Web. A search engine normally consists of four components, as follows: a search interface, a crawler (also known as a spider or bot), an indexer, and a database.
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youtube-dl <url> The path of the output can be specified as: (file name to be included in the path) youtube-dl -o <path> <url> To see the list of all of the available file formats and sizes: youtube-dl -F <url> The video can be downloaded by selecting the format code from the list or typing the format manually: youtube-dl -f <format/code> <url>