xtrlock

xtrlock is a command line tool used in Linux-based systems to lock the X display for the current user. It provides a simple yet effective way to prevent unauthorized access to your system while you are away.

The purpose of xtrlock is to disable the keyboard and mouse input, thereby preventing any interactions with the X display until the user provides the correct password to unlock it. The locked screen appears blank or may display a custom message depending on the configuration.

It is lightweight and uses the XTEST extension to grab keyboard and pointer events, making it compatible with most desktop environments. The tool can be invoked with various options to customize its behavior, like changing the background color or displaying an info message before prompting for the password.

xtrlock also provides functionality to lock only the keyboard, known as the -k option, allowing users to run background tasks while ensuring the system remains secure from accidental keystrokes.

Overall, xtrlock is a useful command line tool for Linux users who prioritize security and need a straightforward method to lock their X display when they are away from the system, preventing unauthorized access.