set the function of the Ctrl-Alt-Del combination
Set CTRL+ALT+DEL to reboot "normally", giving processes a chance to exit first (send SIGINT to PID1)
Based on examination of the linux/kernel/reboot.c code, it is clear that there are two supported functions that the <Ctrl-Alt-Del> sequence can perform.
Immediately reboot the computer without calling sync(2) and without any other preparation. This is the default.
Make the kernel send the SIGINT (interrupt) signal to the init process (this is always the process with PID 1). If this option is used, the init(8) program must support this feature. Since there are now several init(8) programs in the Linux community, please consult the documentation for the version that you are currently using.
When the command is run without any argument, it will display the current setting.
The function of ctrlaltdel is usually set in the /etc/rc.local file.
Display version information and exit.
Display help text and exit.
For bug reports, use the issue tracker at <https://github.com/karelzak/util-linux/issues>.
The ctrlaltdel command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.