hostname Command

Purpose

Displays the name of the current host system.

Syntax

hostname [ { -a | -A | -d | -f | —h | -i | --all-ip-addresses | -s | —V | -y } ] [ HostName ]

Description

The hostname command displays the name of the current host system as returned by the gethostname subroutine. If the hostname command is used without any option, it prints the short hostname. If a new HostName is specified, it sets the hostname. However, only users with root user authority can set the hostname.

Flags

Table 1. Flags
Item	Description
-a or --alias	Displays the alias name of the host.
-A or --all-fqdns	Displays all the Fully Qualified Domain (FQDN) names. This option is useful when multiple DNS entries exist.
-d or --domain	Displays the domain name
-f, --fqdn, or --long	Display the FQDN.
-h or --help	Displays help about the hostname command.
-i or --ip-address	Displays the IP addresses of the host.
--all-ip-addresses	Displays all the IP addresses of the host including IPv4 and IPv6 for all the interfaces.
-s or --short	Displays the short hostname.
-V or --version	Displays version information.
-y, --yp, or --nis	Display the `NIS` or `YP` domain name.

Examples

To display the short hostname of the current host system, enter the following command:
```
hostname

or

hostname -s
```
To display the FQDN of the current host system, enter the following command:
```
hostname -f
```
To display all the IP addresses of the host, enter the following command:
```
hostname --all-ip-addresses
```
To display all the FQDN if there are multiple DNS records, enter the following command:
```
hostname -A
```