What command is used to start a service immediately without enabling it at boot?

The command to start a service immediately without enabling it at boot is executed using systemctl start [service]. This command is part of the Systemd system and service manager, which is standard in Red Hat Enterprise Linux and many other modern Linux distributions.

When you use systemctl start, it activates the specified service right away. This can be particularly useful for services that you only need temporarily or for testing, as this method does not change the service's configuration or its status in the context of system boot. In contrast, enabling a service with systemctl enable [service] would create the necessary links to ensure that the service starts automatically the next time the system is booted, which does not align with the requirement to start the service only for the current session. Starting services using the older service [service] start command does still work, but it's generally considered deprecated in favor of the more modern systemctl interface.

Using systemctl stop [service] is related to halting a service rather than starting it, making it an inappropriate choice for this question as well. Thus, the command systemctl start [service] effectively fulfills the specified criteria.