Linux lock screen command

Three ways to lock your Ubuntu screen

In Ubuntu 18.04, you can use the Super+L shortcut to lock your computer screen. The Super key in the Windows button on your keyboard. In previous versions of Ubuntu, you could use the Ctrl+Alt+L shortcut for this purpose. You can easily view all the keyboard shortcuts from the system Settings utility.

1. How do I lock my desktop in Linux?
2. How do I lock my screen quickly?
3. How do I lock my screen without Ctrl Alt Delete?
4. How do I lock my screen using command prompt?
5. How do I lock a file in Linux?
6. What is Ctrl S in terminal?
7. How do I lock my lock screen?
8. How do I lock my screen in place?
9. How do I remove Ctrl Lock?
10. How do I lock my computer from another user?
11. What is the shortcut key to lock computer?

How do I lock my desktop in Linux?

How to lock your screen. To lock your screen before you leave your desk, either Ctrl+Alt+L or Super+L (i.e., holding down the Windows key and pressing L) should work. Once your screen is locked, you will have to enter your password to log back in.

How do I lock my screen quickly?

Press the Ctrl, Alt, and Del keys at the same time. A screen of options should appear. When it does, click «Lock.»

How do I lock my screen without Ctrl Alt Delete?

Hit the Windows key and the L key on your keyboard. Keyboard shortcut for the lock!

How do I lock my screen using command prompt?

Step 1: Press Windows + R key to open Run command box. Step 2: In the Run dialog box, type rundll32.exe user32. dll,LockWorkStation and then press Enter key to lock computer.

How do I lock a file in Linux?

Locking files with flock. One common way to lock a file on a Linux system is flock . The flock command can be used from the command line or within a shell script to obtain a lock on a file and will create the lock file if it doesn’t already exist, assuming the user has the appropriate permissions.

What is Ctrl S in terminal?

Ctrl+S: Stop all output to the screen. This is particularly useful when running commands with a lot of long, verbose output, but you don’t want to stop the command itself with Ctrl+C. Ctrl+Q: Resume output to the screen after stopping it with Ctrl+S.

How do I lock my lock screen?

1. Open your phone’s Settings app.
2. Tap Security. .
3. To pick a kind of screen lock, tap Screen lock. .
4. Tap the screen lock option you’d like to use.

How do I lock my screen in place?

1. Open Settings > Lock screen & security > Advanced > Screen pinning. .
2. Tap On.
3. Enable Require unlock PIN for unpinning.

How do I remove Ctrl Lock?

a. Go to Start / Settings / Control Panel / Accessibility Options /Keyboard Options. b. Turn off CTRL lock if it’s on.

How do I lock my computer from another user?

Press the Windows logo key and the letter ‘L’ at the same time. Press Ctrl + Alt + Del and then click the Lock this computer option. Create a shortcut to lock the screen.

What is the shortcut key to lock computer?

1. Press Ctrl, Alt and Del at the same time.
2. Then, select Lock this computer from the options that appear on the screen.

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Locking the Desktop Screen From the Command Line

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1. Overview

As a Linux administrator, locking the desktop screen is an important security measure we can use to prevent unauthorized access to our computers. In short, we prevent access to our files, applications, and sensitive information from unauthorized users. There are several ways we can use to lock the desktop screen, but using the command line is quick and easy.

In this tutorial, we’ll discuss how to lock the desktop screen in Linux using gnome-screensaver-command, xdg-screensaver, and dbus-send in the command line.

2. Using the gnome-screensaver-command

gnome-screensaver-command is a Linux utility that allows us to control the GNOME screensaver from the command line. Therefore, we can use it to lock the desktop screen from the command line.

Before using this command, we need to install it:

$ sudo apt install gnome-screensaver Reading package lists. Done Building dependency tree. Done Reading state information. Done . Processing triggers for man-db (2.10.2-1) . Processing triggers for mailcap (3.70+nmu1ubuntu1) . 

The above command installs gnome-screensaver on Ubuntu and Debian-based distributions.

Next, let’s lock our desktop screen:

$ gnome-screensaver-command -l

In the above example, the -l option instructs the running screensaver process to lock the screen immediately. In order to unlock the screen, we’ll need to do some authentication.

3. Using the xdg-screensaver Command

xdg-screensaver is a command-line utility used to interact with the screensaver application in Linux. To clarify, we can use this command to lock the desktop screen, control the screensaver timeout, and get information about the screensaver status.

Now, let’s lock our desktop screen:

Using the above command, our desktop screen will immediately lock, and therefore we’ll require authentication to unlock it.

4. Using the dbus-send Command

dbus-send is a powerful tool that allows us to send D-Bus messages to other applications, services, and even to the system itself. Additionally, we can use this command to lock the desktop screen from the command line in Linux.

The command follows this syntax:

$ dbus-send --type=TYPE --dest=DESTINATION PATH INTERFACE.METHOD [ARGUMENTS] 

It contains these parameters:

• –type – used to specify the type of message being sent, either a method call, a signal, or a property change
• –dest – specifies the name of the target application or service
• PATH – specifies the object path on which to call the method or signal
• INTERFACE.METHOD – specifies the interface and also the method to be called, respectively

$ dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.Lock

The above command locks the desktop screen immediately and will work for the GNOME desktop environment. In order to unlock it, we’ll need to do some authentication.

5. Conclusion

In this article, we’ve discussed how to lock the desktop screen using the gnome-screensaver, xdg-screensaver, and dbus-send commands in Linux. Furthermore, we saw this is a straightforward process that we can complete in just a few steps.

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Three ways to lock your Ubuntu screen

When you have to take a break from work but do not want to end your current session, locking your computer screen is the way out. You can, of course, shut down your system and start it again when you are back, but that means you have to save all your work and open it all in the same state when you need to. Why opt for this second option when your system allows you to temporarily lock your system so that unauthorized people can not access it.

In this article, we will explain three methods to lock your Ubuntu screen; through the UI, through the keyboard shortcut, and through the command line.

We have run the commands and procedures mentioned in this article on a Ubuntu 18.04 and Ubuntu 20.04 LTS system.

Method 1: Through the Settings Panel

The UI based method to lock your Ubuntu screen is through the Settings Panel that can be accessed from the top bar of your Ubuntu desktop.

Click on the downward arrow located at the top right corner of your Ubuntu screen. This is the panel that will appear:

This panel gives you quick graphical access to many configurable system settings. You can lock your computer screen through the Lock icon, which by default is the second last icon located at the bottom on Ubuntu 20.04. As soon as you click on this icon, your computer screen will be locked.

Method 2: Through keyboard shortcut

All Ubuntu systems come with some predefined keyboard shortcuts that you can utilize in order to perform some basic system functions. Since screen locking is also a frequent operation, there is a shortcut for that too. In Ubuntu 20.04, you can use the Super+L shortcut to lock your computer screen. The Super key in the Windows button on your keyboard.

In previous versions of Ubuntu, you could use the Ctrl+Alt+L shortcut for this purpose.

You can easily view all the keyboard shortcuts from the system Settings utility.

The simplest way to access these settings is through the system Dash or the application launcher search bar as follows:

Enter relevant keywords to access keyboard shortcuts in this bar and then click the appropriate search result.

This will open the Settings>Devices>Keyboard view as follows:

Here you can view the list of all the predefined shortcuts, edit one by clicking on it, and also create new custom shortcuts for your ease of use.

Method 3: Through the command line

There is a utility called Gnome Screensaver that lets you lock your Ubuntu screen through the command line.

Open your Ubuntu command line, the Terminal, either through the application launcher search or the Ctrl+Alt+T shortcut.

Then enter the following command as sudo in order to install the Gnome Screensaver utility:

$ sudo apt-get install gnome-screensaver

Please note that only an authorized user can add/remove, and configure software on Ubuntu. Enter the password for sudo and the software will be installed on your system.

You can then use the following command in order to lock your Ubuntu screen:

$ gnome-screensaver-command -l

These were the ways through which you can ensure the security of your system while you are away by locking your Ubuntu screen.

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How can I lock the screen using the new lockscreen from the command line?

Ubuntu 14.04 introduces a new lockscreen that looks similar to the login screen. I am still able to lock the screen using the command gnome-screensaver-command —lock (as I always did before), which under 14.04 does lock the screen, but:

• If you are running it from the desktop, it locks the screen using the new lockscreen.
• If you are running it from a virtual console or via SSH, it locks the screen using the old lockscreen.

I’ve also tried using xdg-screensaver lock , but it works in the same way as gnome-screensaver-command —lock does (only uses the new lockscreen when it’s ran from the desktop).

Running light-locker-command —lock didn’t work, as light-locker is not installed.

I guess there must be some differences between running the same command from the desktop and running it via SSH/virtual console, but I was not able to find any difference in the environment variables.

So, my question is: How can I lock the screen using the new Unity lockscreen and not the old lockscreen from the command line?

This question is probably related as it asks for the new command that needs to be used, so here’s another question: Why does running the same lock command give different results?

Note that gnome-screensaver is not being used anymore in 14.04, according to this bug report:

That’s not really a gnome-screensaver bug, that component stopped being used in trusty.

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