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hostname command in Linux with examples

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hostname command in Linux is used to obtain the DNS (Domain Name System) name and set the system’s hostname or NIS (Network Information System) domain name. A hostname is a name given to a computer and attached to the network. Its main purpose is to uniquely identify over a network.

 Syntax of the `hostname` command in Linux

hostname -[option] [file]

Example: We obtain the system hostname by just typing the hostname without any attributes.  

hostname

hostname

Options          DescriptionSyntax
-a

This option is used to get the alias name of the host system (if any). It will return an empty line if no alias name is set. This option enumerates all configured addresses on all network interfaces. 

hostname -a
-A

This option is used to get all FQDNs (Fully Qualified Domain Name) of the host system. It enumerates all configured addresses on all network interfaces. An output may display the same entries repetitively.

hostname -A
-b

Used to always set a hostname. Default name is used if none specified.

hostname -b
-d 

 This option is used to get the Domain if local domains are set. It will not return anything (not even a blank line) if no local domain is set.

hostname -d
-f 

This option is used to get the Fully Qualified Domain Name (FQDN). It contains short hostname and DNS domain name.

hostname -f
-F 

This option is used to set the hostname specified in a file. Can be performed by the superuser(root) only.

sudo hostname -F filename
-i

This option is used to get the IP (network) addresses. This option works only if the hostname is resolvable.

hostname -i
-I

This option is used to get all IP(network) addresses. The option doesn’t depend on resolvability of hostname.

hostname -I
-s

 This option is used to get the hostname in short. The short hostname is the section of hostname before the first period/dot(.). If the hostname has no period, the full hostname is displayed.

hostname -s
-V

Gives version number as output.

hostname -V

Outputs of Options available in `hostname` command

1) `-a` Option in `hostname` command in Linux

Display all aliases of the host.

Syntax:

hostname -a
hostname -a

hostname -a

2) `-A` Option in `hostname` command in Linux

 Syntax:

hostname -A
hostname -A

hostname -A

3) `-b` Option in `hostname` command in Linux

 Syntax:

hostname -b
hostname -b

hostname -b

4) `-d` Option in `hostname` command in Linux

 Display the domain name of the host if any.

Syntax:

hostname -d
hostname -d

hostname -d

5) `-f` Option in `hostname` command in Linux 

Display the fully qualified domain name (FQDN) of the host.

 Syntax:

hostname -f
hostname -f

hostname -f

6) `-F` Option in `hostname` command in Linux

 This option is used to set the hostname specified in a file. Can be performed by the superuser(root) only. 

Syntax:

sudo hostname -F filename

 

sudo hostname -F filename

sudo hostname -F filename

7) `-i` Option in `hostname` command in Linux

 Display the IP address of the host

Syntax:

hostname -i
hostname -i

hostname -i

8) `-I` Option in `hostname` command in Linux 

 This option is used to get all IP (network) addresses. The option doesn’t depend on resolvability of hostname.

hostname -I
hostname -I

hostname -I

9) `-s` Option in `hostname` command in Linux 

Display the short hostname of the host.

 Syntax:

hostname -s
hostname -s

hostname -s

10) `-V` Option in `hostname` command in Linux

Display the version information about the hostname 

 Syntax:

hostname -V
hostname -V

hostname -V

11) How to set hostname in Linux 

Set the hostname of the system temporarily.

Syntax:

sudo hostname NEW_HOSTNAME
sudo hostname geeksforgeeks

sudo hostname geeksforgeeks

Replace NEW_HOSTNAME with the new hostname you want to set. (Here we have changed it to “geeksforgeeks”)

Set the hostname of the system permanently.

To set the hostame of our system permanently we have to go inside “/etc/hostname” using text editor and change hostname to the hostname we want.

here we can change hostname permanently

here we can change hostname permanently.

Conclusion

This command `hostname` in Linux seems so simple but at the same time it is a very powerful command that allows users to view or set the hostname of the system. It is important for users to know the `hostname` command to manage their Linux system effectively. One can easily understand by this article, as we have discussed many options and also their output, options like `-a`, `-A`, `-b`, `-d`, `-f`, `-F`, `-i`, `-I`, `-s` and `-V`.



Last Updated : 10 May, 2023
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