hostname

Display and set the system's hostname

Supplementary instructions

hostname command Used to display and set the host name of the system.

• The environment variable HOSTNAME also holds the current hostname.
• After using the hostname command to set the host name, the system will not permanently save the new host name, and it will still be the original host name after restarting. If you need to permanently modify the host name, you need to modify the relevant contents of /etc/hosts and /etc/sysconfig/network and restart; you can also use the hostnamectl command to make permanent changes.

grammar

hostname [-b] {hostname|-F file} Set the hostname (or get it from a file)
hostname [-a|-A|-d|-f|-i|-I|-s|-y] displays the formatted name
hostname displays the host name

{yp,nis,}domainname {nisdomain|-F file} Set the NIS host name (or get it from a file)
{yp,nis,}domainname displays the NIS host name

dnsdomainname displays DNS host name

hostname -V|--version|-h|--help print information and exit

Options

-a, --alias display host aliases
-A, --all-fqdns display all FQDN names
-b, --boot Set default hostname if no hostname is available
-d, --domain Display DNS domain name
-f, --fqdn, --long display FQDN name
-F, --file Read hostname or NIS domain name from the given file
-i, --ip-address Display the ip address of the host
-I, --all-ip-addresses display all ip addresses of the host
-s, --short Display short hostname, truncated at first point
-y, --yp, --nis display NIS domain name

Example

show hostname

[root@AY1307311912260196fcZ ~]# hostname
AY1307311912260196fcZ

Temporarily change hostname

[root@AY1307311912260196fcZ ~]# hostname newname

Display all IP addresses of a host

[root@AY1307311912260196fcZ ~]# hostname -I
10.17.0.1 10.18.0.10 172.17.0.1