How to Configure the Ctrl+Alt+Del Shortcut on Linux

ctrlaltdel: Configuring the Ctrl+Alt+Del Key Combination

Function Description

The ctrlaltdel command sets the behavior of the Ctrl+Alt+Del key combination.

It supports two actions: hard (hard reset, immediate reboot without sync) and soft (soft reset, sends SIGINT to the init process, which must support it).

Command Syntax

ctrlaltdel [hard]|[soft]

Option Meanings

hard : Hard reset; pressing Ctrl+Alt+Del triggers an immediate system reboot without invoking sync or other shutdown procedures.

soft : Soft reset; pressing Ctrl+Alt+Del sends a SIGINT (interrupt) signal to the init process, which then handles the shutdown.

-h : Show help and exit.

-V : Display version information and exit.

Examples

Example 1: Set hard reset

# ctrlaltdel hard

Example 2: Use soft reset

# ctrlaltdel soft

Example 3: Show version

# ctrlaltdel -V

Additional Knowledge: Disabling Ctrl+Alt+Del on Linux

Problem

In operations, accidental pressing of Ctrl+Alt+Del can cause an unwanted server reboot.

Solution

Check /etc/inittab to see the configuration for Ctrl+Alt+Del.

Inspect the properties of the target file, e.g., /usr/lib/systemd/system/ctrl-alt-del.target.

Remove the symbolic link to the target.

Reload the init daemon configuration with init q.