Thursday, April 22, 2010

wget: Download entire websites easy

SkyHi @ Thursday, April 22, 2010


wget is a nice tool for downloading resources from the internet. The basic usage is
wget url:



wget http://linuxreviews.org/



Therefore,
wget (manual page) +
less (manual page)
is all you need to surf the internet. The power of wget is
that you may download sites recursive, meaning you also get all pages (and images and other data) linked on the front page:



wget -r http://linuxreviews.org/



But many sites do not want you to download their entire site. To prevent this, they check how browsers identify. Many sites refuses you to connect or sends a blank page if they detect you are not using a web-browser. You might get a message like:



Sorry, but the download manager you are using to view this site is not supported. We do not support use of such download managers as flashget, go!zilla, or getright



Wget has a very handy -U option for sites like this. Use -U My-browser to tell the site you are using some commonly accepted browser:


  wget  -r -p -U Mozilla http://www.stupidsite.com/restricedplace.html



The most important command line options are --limit-rate= and --wait=. You should add --wait=20 to pause 20 seconds between retrievals, this makes sure you are not manually added to a blacklist. --limit-rate defaults to bytes, add K to set KB/s. Example:



wget --wait=20 --limit-rate=20K -r -p -U Mozilla http://www.stupidsite.com/restricedplace.html



A web-site owner will probably get upset if you attempt to download his entire site using a simple wget http://foo.bar command. However, the web-site owner will not even notice you if you limit the download transfer rate and pause between fetching files.



Use --no-parent



--no-parent is a very handy option that guarantees wget will not download anything from the folders beneath the folder you want to acquire. Use this to make sure wget does not fetch more than it needs to if just just want to download the files in a folder.


REFERENCE
http://linuxreviews.org/quicktips/wget/