1、从FTP下载文件
# curl -u username:password -O ftp://ip/file
? % Total ? ?% Received % Xferd ?Average Speed ? Time ? ?Time ? ? Time ?Current
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Dload ?Upload ? Total ? Spent ? ?Left ?Speed
100 37986 ?100 37986 ? ?0 ? ? 0 ?27854 ? ? ?0 ?0:00:01 ?0:00:01 --:--:-- 29561
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2、读取访问一个URL的Header头信息
# curl -I http://www.jjwxc.net
HTTP/1.1 200 OK
Content-Type: text/html
Vary: Accept-encoding
Accept-Ranges: bytes
Content-Encoding: gzip
Last-Modified: Tue, 05 Feb 2013 17:19:15 GMT
Content-Length: 11495
Date: Wed, 06 Feb 2013 03:46:30 GMT
X-Cache: HIT from CU-86-SH-JJCDN
X-Cache-Lookup: HIT from CU-86-SH-JJCDN:80
Age: 10375
PowerCDN: HIT from tj6.powercdn.com
Via: 1.1 tj6.powercdn.com (PowerCDN/2.4)
Connection: close
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3、伪造来源地址，有的网站会判断，请求来源地址
# curl -e http://www.baidu.com http://www.jjwxc.net