whois
whois功能说明：查找并显示用户信息。
语 法：whois [帐号名称]
补充说明：whois指令会去查找并显示指定帐号的用户相关信息，因为它是到Network Solutions的WHOIS数据库去查找，所以该帐号名称必须在上面注册方能寻获，且名称没有大小写的差别。
whois
whois[options] query[@server[:port] ] jwhois [options] query[@server[:port] ]
Search a whois database for a domain name, IP address, or NIC name. The information returned varies, but usually contains administrative and technical contacts so that you can find a person to handle problems at that domain. By default, the command returns information on .com, .net, and .edu domains, but other hosts can be queried for other domains using host or the -h option.
Options
Indicate the end of options. A subsequent string that begins with a hyphen on the command line is taken as a query string.
Do not rewrite query according to configuration before sending to server.
Specify a configuration file to use instead of the default /
etc/jwhois.conf .
Disable reading and writing to the cache.
Force the lookup query to go to the host, even if it is available from the cache.
Query the whois server on the specified host. Same as host on the command line. By default, queries the server in the environment variable NICNAMESERVER or WHOISSERVER if either is set; otherwise queries
whois.internic.net .
Print help message and exit.
Display every step in a redirection. The default is to display only the last step.
Disable redirection from one server to the next.
Connect to the specified port. Same as port on the command line. Default is 43.
Force use of the rwhois protocol, instead of HTTP or whois.
Request receiving rwhois servers to display the results in the specified display instead of the default.
Request receiving rwhois servers to limit the number of matches to the specified limit.
Disable built-in support for
whois-servers.net .
Verbose. Display the query before sending it to the server.
Print version information and exit.