hostnamectl — Control the system hostname
hostnamectl [OPTIONS...]  {COMMAND} 
hostnamectl may be used to query and change the system hostname and related settings.
This tool distinguishes three different host names: the high-level "pretty" hostname which might include all kinds of special characters (e.g. "Lennart's Laptop"), the static hostname which is used to initialize the kernel hostname at boot (e.g. "lennarts-laptop"), and the transient hostname which might be assigned temporarily due to network configuration and might revert back to the static hostname if network connectivity is lost and is only temporarily written to the kernel hostname (e.g. "dhcp-47-11").
Note that the pretty hostname has little restrictions on the characters used, while the static and transient hostnames are limited to the usually accepted characters of internet domain names.
The static host name is stored in
                /etc/hostname, see
                hostname(5)
                for more information. The pretty host name, chassis
                type and icon name are stored in
                /etc/machine-info, see
                machine-id(5).
The following options are understood:
-h, --help¶Prints a short help text and exits.
--version¶Prints a short version string and exits.
--no-ask-password¶Don't query the user for authentication for privileged operations.
-H, --host¶Execute the operation remotely. Specify a hostname, or username and hostname separated by @, to connect to. This will use SSH to talk to a remote system.
--static, --transient, --pretty¶If set-hostname is invoked and one or more of these options are passed only the selected hostnames is updated.
The following commands are understood:
Show current system hostname and related information.
Set the system
                                hostname. By default this will alter
                                the pretty, the static, and the
                                transient hostname alike, however if
                                one or more of
                                --static,
                                --transient,
                                --pretty are used
                                only the selected hostnames are
                                changed. If the pretty hostname is
                                being set, and static or transient are
                                being set as well the specified host
                                name will be simplified in regards to
                                the character set used before the
                                latter are updated. This is done by
                                replacing spaces by "-" and removing
                                special characters. This ensures that
                                the pretty and the static hostname
                                are always closely related while still
                                following the validity rules of the
                                specific name. This simplification of
                                the hostname string is not done if
                                only the transient and/or static host
                                names are set, and the pretty host
                                name is left untouched. Pass the empty
                                string "" as hostname to reset the
                                selected hostnames to their default
                                (usually
                                "localhost").
Set the system icon name. The icon name is used by some graphical applications to visualize this host. The icon name should follow the Icon Naming Specification. Pass an empty string to this operation to reset the icon name to the default value which is determined from chassis type (see below) and possibly other parameters.
Set the chassis
                                type. The chassis type is used by some
                                graphical applications to visualize
                                the host or alter user
                                interaction. Currently, the following
                                chassis types are defined:
                                desktop,
                                laptop,
                                server,
                                tablet,
                                handset, as well as
                                the special chassis types
                                vm and
                                container for
                                virtualized systems that lack an
                                immediate physical chassis. Pass an
                                empty string to this operation to
                                reset the chassis type to the default
                                value which is determined from the
                                firmware and possibly other
                                parameters.