Use wget under Unix

use wget:

example 1:
wget -nc -r http://www.example.com/
download the recusive site from http://www.example.com/

example 2:
wget -nc -l -3 ftp://username:password@hostname:portnumber/directory1/directory2/
download all files in the directory "directory2"

example 3:
wget -m -np http://xxx.xxx.xxx/target.html
将以 target.html 为中心的整个相关文件抓下来，m=mirror，np=no parent 不下载上层目录的文件)