ctrlaltdel - Man Page

• Get current setting: ctrlaltdel
• Set CTRL+ALT+DEL to reboot immediately, without any preparation: sudo ctrlaltdel hard
• Set CTRL+ALT+DEL to reboot "normally", giving processes a chance to exit first (send SIGINT to PID1): sudo ctrlaltdel soft

tldr.sh

ctrlaltdel hard|soft

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.

hard

Immediately reboot the computer without calling sync(2) and without any other preparation. This is the default.

soft

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.

-h,  --help

Display help text and exit.

-V,  --version

Print version and exit.

/etc/rc.local

Peter Orbaek

init(8), systemd(1)

For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.

The ctrlaltdel command is part of the util-linux package which can be downloaded from Linux Kernel Archive.

reboot(2).