在Linux中修改主機名其實是一件非常容易的事情，但網上有些帖子在這一塊都說得很復雜，諸如修改什么配置文件之類的等等，用hostname這個命令我們就可以很輕易地修改了。
Usage: hostname [-v] {hostname|-F file} set hostname (from file)
domainname [-v] {nisdomain|-F file} set NIS domainname (from file)
hostname [-v] [-d|-f|-s|-a|-i|-y|-n] display formatted name
hostname [-v] display hostname</p><p>hostname -V|–version|-h|–help print info and exit</p><p>dnsdomainname=hostname -d, {yp,nis,}domainname=hostname -y</p><p>-s, –short short host name
-a, –alias alias names
-i, –ip-address addresses for the hostname
-f, –fqdn, –long long host name (FQDN)
-d, –domain DNS domain name
-y, –yp, –nis NIS/YP domainname
-F, –file read hostname or NIS domainname from given file</p><p>This command can read or set the hostname or the NIS domainname. You can
also read the DNS domain or the FQDN (fully qualified domain name).
Unless you are using bind or NIS for host lookups you can change the
FQDN (Fully Qualified Domain Name) and the DNS domain name (which is
part of the FQDN) in the /etc/hosts file.
