On a Linux system, you can use the systemctl command to put a laptop or netbook in hibernate or suspend mode. systemctl is a utility that is part of the systemd system and service manager, and it is used to control and manage system services, processes, and other aspects of the system.
To put the system in hibernate mode, you can use the following command:
$ sudo systemctl hibernate
This will save the current state of the system to disk, and then shut down the system. When the system is restarted, it will resume from the saved state.
To put the system in suspend mode, you can use the following command:
$ sudo systemctl suspend
This will save the current state of the system to memory, and then shut down the system. When the system is restarted, it will resume from the saved state.
Keep in mind that using the systemctl command to put the system in hibernate or suspend mode may not work on all Linux systems, and it may require additional configuration or software to be installed. Consult the systemctl man page or documentation for your system for more information.
It's also worth noting that there are other methods for putting a laptop or netbook in hibernate or suspend mode on a Linux system, such as using the pm-hibernate or pm-suspend commands (part of the pm-utils package), or using the rtcwake command. The specific method that you choose will depend on your Linux distribution and version, as well as the hardware and configuration of your system.