转自curl官网,查询参考。
 
NAME
       curl - transfer a URL
SYNOPSIS
       curl [options] [URL...]
DESCRIPTION
       curl  is  a tool to transfer data from or to a server, using one of the
       supported protocols (HTTP, HTTPS, FTP, FTPS,  SCP,  SFTP,  TFTP,  DICT,
       TELNET,  LDAP  or  FILE).  The command is designed to work without user
       interaction.
       curl offers a busload of useful tricks like proxy support, user authen-
       tication,  FTP upload, HTTP post, SSL connections, cookies, file trans-
       fer resume and more. As you will see below, the number of features will
       make your head spin!
       curl  is  powered  by  libcurl  for  all transfer-related features. See
       libcurl(3) for details.
URL
       The URL syntax is protocol-dependent. You\'ll find a  detailed  descrip-
       tion in RFC 3986.
       You  can  specify  multiple  URLs or parts of URLs by writing part sets
       within braces as in:
 
 放不下了,附件中。