How to use the command xtrlock (with examples)

The xtrlock command is used to lock the X display until the user supplies their password. When executed, it will display a padlock cursor on the screen, preventing any user interaction until the correct password is entered.

Use case 1: Lock the display and show a padlock instead of the cursor

Code:

xtrlock

Motivation: Locking the display with xtrlock without any additional arguments will display a padlock cursor instead of the normal mouse cursor. This can be useful in situations where you want to temporarily disable user interaction while still displaying a visual indicator that the display is locked.

Explanation: The command xtrlock with no additional arguments will lock the X display and display a padlock cursor.

Example output: The display will be locked, and a padlock cursor will be displayed on the screen. The user will need to enter their password to unlock the display.

Use case 2: Display a blank screen as well as the padlock cursor

Code:

xtrlock -b

Motivation: Using the -b option with xtrlock will not only display the padlock cursor but also turn the screen black. This can be useful in situations where you want to completely hide the contents of the screen while it is locked.

Explanation: The -b option is used to display a blank screen along with the padlock cursor. This means that the screen will turn black, preventing anyone from seeing what was previously displayed on the screen.

Example output: The display will be locked, and a padlock cursor will be displayed on a black screen. The user will need to enter their password to unlock the display.

Use case 3: Fork the xtrlock process and return immediately

Code:

xtrlock -f

Motivation: Using the -f option with xtrlock will fork the process and return immediately. This means that xtrlock will run in the background, allowing you to continue using the terminal for other tasks while the display is locked.

Explanation: The -f option is used to fork the xtrlock process and return immediately. This means that xtrlock will run in the background, freeing up the terminal for other tasks.

Example output: The display will be locked, and a padlock cursor will be displayed. However, instead of waiting for the user to enter the password, the xtrlock process will run in the background and return to the terminal prompt immediately.

Conclusion:

The xtrlock command is a useful tool for temporarily locking the X display. By using different options, you can customize the locking behavior to suit your needs. Whether you want to display a padlock cursor, a blank screen, or run xtrlock in the background, this command provides flexibility and security to your display locking requirements.