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wget is a powerful command-line tool to mirror or copy entire (with properly access) web and ftp sites, and not only. Here's some interesting powerful uses.
No parent option
If you are doing a mirror, but you only want to mirror a subdirectory of the main site (for example, just /news/), you might run into a problem. Because many of the pages at /news/ link back to /, you'll inadvertently end up downloading the whole site.
The solution to this, pointed out by Todd in the comments, is to use the no-parent option, -np.
In our example, we'd do (in a bash shell, if you are on Linux, or on a command prompt, in Windows):
$ wget -mk -w 20 -np http://example.com/news/
Update only changed files
Continuing in our mirroring scenario, another extremely useful option for preserving bandwidth on both sides is to update only the files that the server reports as changed.
This option is -N.
$ wget -mk -w 20 -N http://example.com/
Random delay on mirror
And finally for our mirror-specific tips, you can also randomise the delay between downloads. There are several reasons you might want to do this, including sites that don't take kindly to being mirrored, even considerately, and block clients that they suspect of doing it (some bots can be pretty nasty, and you might be categorised as one of them).
Randomising the wait time - and combining with the user agent option below - can be steps to circumvent this automatic protection.
If you do find yourself using this feature for that reason, please continue to be considerate and follow any rules regarding the content you've been given. Mirror responsibly.
$ wget -w 20 --random-wait -mk http://example.com/
The wait value - 20 in this case - is used as a base value to calculate what the random wait times will be. They will alternate between 0 and 2 times that value (in this case, 0-40 seconds).
Custom user agent
Some sites might have some strange restrictions on what browsers can access it, or perhaps have different versions of a site depending on the browser used. I can't say I agree with sites that do this, unless there's a really good reason, but it shouldn't stop you from using wget for access.
Using wget, you can set a fake user agent string so that the program reports itself as a different browser.
$ wget -U "user agent" http://example.com/
Combine the -U option with any others you want, obviously. Here are a few user agents you can use to get you started:
IE6 on Windows XP: Mozilla/4.0 (compatible; MSIE 6.0; Microsoft Windows NT 5.1)
Firefox on Windows XP: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
Firefox on Ubuntu Gutsy: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.14) Gecko/20080418 Ubuntu/7.10 (gutsy) Firefox/2.0.0.14
Safari on Mac OS X Leopard: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en) AppleWebKit/523.12.2 (KHTML, like Gecko) Version/3.0.4 Safari/523.12.2
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