[Linux] Bash hostname Uso equivalente: Display or set the system’s hostname

Overview

The hostname command in Bash is used to display or set the system’s hostname, which is the name that identifies the machine on a network. It plays a crucial role in network communication and can be used to configure how the system is recognized by other devices.

Usage

The basic syntax of the hostname command is as follows:

hostname [options] [arguments]

Common Options

• -a, --alias: Display the alias name of the host.
• -d, --domain: Show the domain name of the host.
• -f, --fqdn: Display the fully qualified domain name (FQDN).
• -i, --ip-address: Show the IP address associated with the hostname.
• -s, --short: Display the short hostname (without domain).
• -V, --version: Show the version of the hostname command.

Common Examples

Here are some practical examples of using the hostname command:

1. Display the current hostname:

   hostname
   

2. Display the fully qualified domain name:

   hostname -f
   

3. Show the short hostname:

   hostname -s
   

4. Display the IP address of the hostname:

   hostname -i
   

5. Set a new hostname (requires superuser privileges):

   sudo hostname new-hostname
   

Tips

• Always ensure you have the necessary permissions when changing the hostname, as it typically requires superuser access.
• After changing the hostname, consider updating the /etc/hosts file to reflect the new hostname for local resolution.
• Use the hostnamectl command on systems with systemd for more advanced hostname management, including setting static, transient, and pretty hostnames.