description:
Send URL.
curl is a tool that uses supported protocols (DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP) transfer data from the server. The command is designed to work without user interaction.
curl provides a lot of useful tricks, such as proxy support, user authentication, FTP upload, HTTP post, SSL connection, cookies, file transfer recovery, Metalink, etc. As you will see below, the number of these features will make you confused!
libcurl provides curl support for all transfer-related functions. For details, see libcurl(3).
URL
URL语法与协议有关。 您会在RFC 3986中找到详细的说明。
您可以通过在大括号内编写部分集并用如下所示引用URL来指定多个URL或URL的一部分：
http://site.{one,two,three}.com
或者您也可以使用[]来获取字母数字系列的序列，如下所示：
"ftp://ftp.example.com/file[1-100].txt"
"ftp://ftp.example.com/file[001-100].txt" (with leading zeros)
ftp://ftp.example.com/file[a-z].txt
不支持嵌套序列，但是可以将多个序列彼此相邻使用：
HTTP://example.com/archive[1996-1999]/Vol[1-4]/part{a,b,c}.HTML
您可以在命令行上指定任意数量的URL。 它们将以指定顺序以顺序方式获取。 您可以在命令行上以任意顺序指定命令行选项和URL。
您可以为范围指定一个步进计数器&#x