screen can be useful when you need to run multiple programs from a terminal. Have you tried running gnome-screensaver with --debug while applying commands to it with gnome-screensaver-command? In the United States, must state courts follow rulings by federal courts of appeals? To lock your computer in Linux, you can use the "Lock" button in the system menu, or you can press Ctrl+Alt+L. If we press Ctrl+A and D to detach the window, and then reattach it, well lose the split-pane view. Again, to switch between the windows, we press Ctrl+A and the number (0 or 1) of the window we want to switch to. Thanks. You can return to this session by authenticating in the greeter. Our examples are constrained to the size of our screenshots, so our windows will look a little cramped. Sorry, something went wrong. Next, well run a few processes that allow us to monitor some aspects of our computer. When the download starts, we press Ctrl+A, and then press D to detach the session. We press Ctrl+A, and then C to create a fresh window. Its important to note that these shortcuts are case-sensitive. RELATED: 10 Basic Linux Commands for Beginners Sorry, the video player failed to load. You can have multiple windows (from 0 to N) in a screen session. During his career, he has worked as a freelance programmer, manager of an international software development team, an IT services project manager, and, most recently, as a Data Protection Officer. His writing has been published by howtogeek.com, cloudsavvyit.com, itenterpriser.com, and opensource.com. Password: How to Manage an SSH Config File in Windows and Linux, How to Run Your Own DNS Server on Your Local Network, How to Run GUI Applications in a Docker Container, How to View Kubernetes Pod Logs With Kubectl, How to Check If the Docker Daemon or a Container Is Running, How to Use Cron With Your Docker Containers. To lock a text file in Linux, we will reference the following syntax: $ flock -x PATH_TO_FILE_TO_LOCK -c COMMAND The -x option is for obtaining a write lock to the targeted file. It isnt a shell, so we cant type anything in it. Dave McKay first used computers when punched paper tape was in vogue, and he has been programming ever since. For example, to switch to shell number 3, press Ctrl+a then 3. You can press Ctrl+a and K to kill or terminate the screen window. https://askubuntu.com/questions/184728/how-do-i-lock-the-screen-from-a-terminal. Screen will use the active area to perform the split functions and create screen functions. Why would Henry want to close the breach? It's a command that allows you to detach an SSH session and then reconnect to it. Oncetop is running in the window, we hit Ctrl+A, and then D to detach the window. Let's look at some of the reasons you might want to try it out. You need the number from the start of the window name to reattach it. A solution that is more likely to be independent from the desktop environment in use: Thanks for contributing an answer to Super User! Unlock login screen using command line. EDIT: It looks and acts like a screen lock, but I have noticed that I can "skirt around it" by switching to a text terminal and back to the X terminal (on my machine Ctrl-Alt-F2 then Ctrl-Alt-F6 does that). You can continue even after you close the terminal or log out the user. Dave is a Linux evangelist and open source advocate. Thats pretty nifty! Were returned to the original, remote terminal window. For example, the following command starts a screen session named ubuntu. What is SSH Agent Forwarding and How Do You Use It? "Ctrl-a" "n" screen command allows you to move forward and back. Thank you for your comment and edit. Lets look at some of the reasons you might want to try it out. After opening the screen session, you can press Ctrl+a ? You can get a list of windows with their corresponding names and IDs by entering [ ctrl + a ] + ["]. We select and review products independently. It allows you to run multiple terminals from a single session. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company. The lower region displays the new window and gives us a command prompt. You do not hit all the keys at once. Our two processes are now running. Lets see more about Screen. RELATED: 37 Important Linux Commands You Should Know, RELATED:Best Linux Laptops for Developers and Enthusiasts. Can You Really Use a Flamethrower to Clear Snow Off Your Driveway? To create a new window with the existing shell, you can use Ctrl+a followed by c character. To detach and logout from the screen session press the Ctrl+a+d key in sequence. That has nothing to do with the command. The Screen command in Linux allows the user to create multiple virtual terminals that can be saved by name and reopened using keyboard shortcuts. Familiarizing yourself with it will be time well spent! Sounds good? Learn how to use it with some practical examples., An independent, reader-supported publication focusing on Linux Command Line, Server, Self-hosting, DevOps and Cloud Learning. Ill explain that to you. The download process is still running but the window showing the download is removed. Were going to use watch to repeatedly run vmstat, so we get a frequently updated display of the virtual memory usage on our computer. I'm not sure if I'm doing something wrong here. Right now, I have to go to Menu > Preferences > Power Manager > Security then check or uncheck the check box marked "Lock screen when system is going for sleep", then in a terminal find the process id of xfce4-power-manager, then send a HUP signal to that PID . All Rights Reserved, The standard operation is to create a new window with a shell in it, run a, You can connect to a remote machine, start a. Disable screensaver / screen blank via command line? After pressing these keys you will get a message " detached " on the screen when session is detached. How to check your lockscreen state You can also use the gnome screensaver command to check whether your screen is locked,. Syntax: Data Structures & Algorithms- Self Paced Course, Ccat Colorize Cat Command Output command in Linux with Examples. 15+ SSH command examples in Linux [Cheat Sheet] To say it can do a lot is the granddaddy of understatements. In this Linux tip, learn how to use the screen command. screen is a command-line utility that multiplexes a physical terminal between several processes in Linux. From here, I can start another session. His writing has been published by howtogeek.com, cloudsavvyit.com, itenterpriser.com, and opensource.com. cat command. 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. You can start screen and apply a memorable name. One way is to go to the "System Settings" and then click on "Power." From there, you can click on the "Lock Screen" tab and uncheck the "Lock Screen" option. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. 50,354 Solution 1. Especially, if youre working on a remote machine. Is there any way that I can lock the screen CLI-style? To move it to the lower region, we press Ctrl+A, and then Tab. Were going to download a big file, so we can use a long-running process as an example. Screen used by Pungki Arianto on mint. In the above creating window example to switch on screen window to other screen window, this command "Ctrl-a" "n" switches you to the next window. Welcome back! You use [ctrl + a]+ k to kill the active screen. You can also use a screen session to allow two people to see and interact with the same window. No need of a command line: . There are so many ways to customize your terminal using GNU Screen. And for the commands look into the link in . Commentdocument.getElementById("comment").setAttribute( "id", "a0cac8adfacc2dc9d11c7977d9ebcabc" );document.getElementById("gd19b63e6e").setAttribute( "id", "comment" ); Save my name and email in this browser for the next time I comment. Can I Use iCloud Drive for Time Machine Backups? After hes connected, he starts a screen session called ssh-geek using the -S (session name) option. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. The Super key in the Windows button on your keyboard. Ctrl-a + X: Close active Split window Ctrl-a + Q: Close all Split windows Ctrl-a + d: It detach a screen session without stopping it. If we type exit, as shown below, it disconnects the SSH session and were back on our local computer: After were reconnected and logged in, we can type the following to reattach the screen session: Were now reconnected to our still-running instance of top. No fancy colors or graphics with that one, though. If youre not getting the same results, you may have made a mistake when naming the session (or forgotten all together). I want to be able to quickly and easily enable and disable the lock screen. To delete a file, click on it and then press "Delete.". He types the following, using the -x (multiscreen mode) optionto attach the session: On a Manjaro computer, another person connects to the Ubuntu computer with the same account credentials, as shown below: Once shes connected, she types thescreen command and uses the -X (multiscreen mode) option to join the same window session, like so: Now, anything either person types, the other will see. This splits the lower region vertically. Making statements based on opinion; back them up with references or personal experience. Does it asks for password at the time of unlock in other Linux flavors? This will display the kernel buffer messages; new messages will appear as they occur. He also uses the -d (detach) and-m (enforced creation) options to create a new screen session thats already detached. But if I have an open terminal session on one of the tty's (which I can access with Ctrl - Alt - F1, for example) - then it is not locked, and somebody can still use it to do some harm. Screen is fairly easy to use, but it can still be a little confusing for new users specially because it relies completely on keyboard shortcuts in the terminal. Is energy "equal" to the curvature of spacetime? The cursor moves to the lower region, which really is just an empty space. Super User is a question and answer site for computer enthusiasts and power users. To switch between the windows, do Ctrl-a + Tab. Hi when I logged as a ordinary user then Ctrl + Alt + L locks the screen and also at the time of unlock asks for a password, but when I logged in as a root it locked the screen but didn't asked for a password. You will need to create a screen in order to do that. If he had met some scary fish, he would immediately return to the surface, Connecting three parallel LED strips to the same power supply. He loves open source, Taco Bell, and a Chi-weenie named Max. How do I quickly lock my screen? You can check to see if its installed by running the following: I am using Pop OS which is a Debian derivative distribution that uses the apt package manager. refer here https://askubuntu.com/questions/184728/how-do-i-lock-the-screen-from-a-terminal. PSE Advent Calendar 2022 (Day 11): The other side of Christmas, Central limit theorem replacing radical n with n, Counterexamples to differentiation under integral sign, revisited. We have to provide the name of the account with which were going to connect and the address of the remote computer. Are defenders behind an arrow slit attackable? Also, you can enable or disable screen locking. If its a continual process, youll eventually want to terminate it. Is this an at-all realistic configuration for a DHC-2 Beaver? This is handy if you want to lock your screen quickly. The screen lock settings are inside of the Workspace Behavior tab How to do it from command prompt? I'm trying to target as many desktop managers as possible (mostly LightDM, but GDM, KDM, SLiM, XScreensaver, etc. To hop between thescreen windows, you press Ctrl+A, and the number of the window. However, you may find that you cannot input anything on the active window. To activate screensaver and lock the screen after 10 minutes: You can also modify the state of a user by locking or unlocking with usermod. You can conveniently enable the automatic screen lock through Linux Mint 20 CLI by executing the following command in it: $ gsettings set org.gnome.desktop.screensaver lock-enabled true This command will instantly enable the Linux Mint 20 automatic screen lock and it will not produce any output on the terminal as shown in the image below: Help us identify new roles for community members. To detach from the screen session, you can press Ctrl+a and d character. How do you prevent Gnome from asking for password all the time? In previous versions of Ubuntu, you could use the Ctrl+Alt+L shortcut for this purpose. The shell will be assigned to the first available number from 0 to N. You can view the number and title of a window by pressing Ctrl+a and N. After creating multiple windows, you will need to switch between them. Christopher works as a Software Developer in Orlando, FL. Our download begins, and the curl output shows us the progress. A message tells you that a screen window labeled 23167.pts-0.howtogeek has been detached. How do I safely kill xscreensaver from a script/the command line? While running an ssh session on a remote machine, the session may get disconnected. @Burgi I do not think that you provided a clear explanation as to why my answer is not valid, but I did find issues with my answer. By submitting your email, you agree to the Terms of Use and Privacy Policy. This is different than the naming of screens you performed earlier with screen -S [name]. The following are the most common cases in which you would use the screen command, and well cover these further in this article: To install screen on ubuntu, use this command: To installscreen on Manjaro, use the following command: To start screen, simply type it as shown below and hit Enter: Youll see a page of license information. i tried the "xscreensaver-command -lock" command, which I found through google.. but that just says that it can't find a running screensaver to begin with. If you want to control screen lock from the command line, here is how to do it. You can send running processes and sessions to background without interrupting your current workflow. When creating a new session, you can specify a name for the session using the -S option. When you do this, youll stretch your terminal window to a size that makes this step useful. The first one we created is window zero (0), the next is window 1, and so on. Both people are now sharing a screen session thats running on a remote Ubuntu computer. The -c option will enable us to pass a single Linux supported command e.g. This is nothing to panic about. @user3134198 Not what I said: System settings -> Brightness and Lock -> Lock -> On. RELATED: How to Use the dmesg Command on Linux. 14) Lock screen session. In previous versions (eg Mint 17), it was possible with Code: Select all gnome-screensaver-command -l , but now it is not working anymore, because I think the screen-saver program was changed. You have to go to your System Settings, and check that password is required to disable screensaver. Gnome, KDE, XFCE, LXDE,Mate,Cinnamon,? Once your screen is locked, you will have to enter your password to log back in. dm-lock would then just exit. With the cursor in the lower region, we press Ctrl+A and C to create a new window with a shell in it. If youre more experienced, feel free to share some of your go-to setups with other readers. As you can see, the free screen session is no longer active. This will effectively put you in the driver seat as you demo the functionality. If we press Ctrl+A and 1, it takes us back to the vmstat window. Great! Success! To get a useful display, we press Ctrl+A, and then press 0 to display the dmesg window in this region. To do this, we press Ctrl+A, and then Shift+S (a capital S is required). Another way is to run the "gsettings" command with the "org.gnome.desktop.screensaver" and "lock-enabled" options. If my articles on GoLinuxCloud has helped you, kindly consider buying me a coffee as a token of appreciation. It means that you can leave your computer and be sure that nobody will come to unauthorized operations. Check your email for magic link to sign-in. After over 30 years in the IT industry, he is now a full-time technology journalist. Password: Since I detached my free session again to enter this, I get the following output: If you didnt name your sessions, they will be identifiable by an assigned PID and a computer ID. Open your Ubuntu command line, the Terminal, either through the application launcher search or the Ctrl+Alt+T shortcut. We type the following to name our session bigfile: When screen launches our session, we see a blank window with a command prompt. The cursor is highlighted in the screenshot below. After a moment you will be left with something like this: You can confirm by listing all the sessions with -ls again. You can also connect remote computers to the screen session. It is used for tracing the route to the end server. To lock the screen session, you need to press Ctrl+a and x. I will then use the [ctrl + a] + d keyboard shortcut to detach it. Check your inbox and click the link. To learn more, see our tips on writing great answers. Here are some more useful key combinations: With screen, you can start a window session, detach it so its still running in the background, log off or back in, and reattach the session. screen may not be available by default in your system. It also supports split-screen displays and works over SSH connections, even after you disconnect and reconnect! How to lock screen and at the time of unlock should ask password? Not sure if it was just me or something she sent to the whole team. -. We press Ctrl+A and Tab to move to the new region. Lets go to the next step and view both screens in one window. Open System Settings in KDE Then, navigate to the Workspace Behavior tab, followed by Screen Locking. Okay, if youre following along you should have the free session open. RELATED: How to Create and Install SSH Keys From the Linux Shell. Its a really great way to improve your productivity and make your workflow a little simpler when youre doing administration tasks via the command line. Screenshot of multiple terminals opened in one terminal window To unlock the folder, right-click it and select "unlock . By using our site, you Lets make an SSH connection to our computer from a different one with thesshcommand. This can be achieved by editing the .screenrc file which can usually be found in /etc/screenrc. This will switch to a greeter with a hint that the screen is locked. You can lock the computer by running gnome-screensaver-command with the -l flag like so: gnome-screensaver-command -l However this will only work if you have Gnome Screensaver running for your session (should be - unless you've disabled it) you can start that from the commandline with: gnome-screensaver Share Improve this answer Follow to view the list of all commands. Either way, when the process ends, you can typeexitto exit from the screen. Both sessions will still be running. Asking for help, clarification, or responding to other answers. Screen is not installed by default, so I will type: If you are using a different package manager, obviously this command may be different. centos 7: control idle (screen blanking) time? The process can then re-attach the session at a later time, and the terminals are still there, the way it was left. In this setting, you can set screen inactivity period and screen lock delay. If you need to unlock your own session, just run loginctl unlock-session (no root required because it's your own session). We cant show you an image of the next bit, because its a keystroke sequence. We can press Ctrl+A, and then D to detach from this session; we can reattach later. It depends on your environment, but in any case physlock (look it up) will lock your screen in whichever environment (X, Wayland, VT, or other). Detach once again using the [ctrl + a] + d keyboard shortcut. What truly makes screen indispensable is the ability to split the terminal into multiple windows within one session arranged horizontally or vertically. Lets call it free (because Ill use free command here but it can be named anything like session2 etc) and enter: Combining watch command with free lets you constantly monitor RAM usage. Were not returned to the command prompt because dmseg is waiting for new messages, and will display them as they arrive. How-To Geek is where you turn when you want experts to explain technology. Try running vlock or if your system has GNU-screen, you can lock it up using ctrl x ( more screen cmds) Using screen you can keep your background processes running which you can attach to later using the cmds mentioned in the link. Well, lets start a process thats going to take a long time to complete. Youre returned to the terminal window from which you launched the screensession. You will notice the window name in the bottom left corner. Hey guys.. i want to know what it the command KDE uses to kick ont he screen saver and lock the screen?? There are a few ways to turn off screen lock in Linux. If you have a sugge. Alternatively, you can press Ctrl+A, and then K to forcibly kill a window. However, youre now running a shell inside a multiplexed terminal emulator. I believe it depends on your display manager. It is possible to lock screen session without locking you normal session user. We type the following to start a screen session called monitor: At the command prompt in our new window session, well launch dmesgand use the -H (human-readable) and -w (wait for new messages) options. In the table, you can see the option to rename windows. How to Hack WPA/WPA2 WiFi Using Kali Linux? For a piece of software that first saw the light of day in 1987, screenstill packs a good productivity wallop. You can use the -S (session name) option to name your screen session. If you forget it, you can always use the -ls (list) option, as shown below, to get a list of the detached windows: When youre ready, you can use the -r (reattach) option and the number of the session to reattach it, like so: The window thats been working away in the background is now brought back to your terminal window as if it had never left. When a process is started with screen, the process can be detached from session & then can reattach the session at a later time. You can use your Linux password to unlock the screen. With Screen, you can do all of it from one single screen. I am inside Vmware and directly using on "Terminal". Well now split the lower pane vertically, and add a third process to the display. Your billing info has been updated. You can use the following command to list all your open screen sessions. I will start an instance of the top command. This method uses your system's password to lock the session. screen is a command-line utility that multiplexes a physical terminal between several processes in Linux. First, youll want to see if this software is already included with your Linux distribution. I'm assuming you have a recent linux system with systemd (e.g. All subfolders and folders have been placed under lock and key. For GDM, it would be: gnome-screensaver-command -l For XScreensaver: xscreensaver-command -lock We type the following to use the -ls (list) option with screen to see the details of our detached session: Behind the numeric identifier (23266), we see the name of our session (bigfile). A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Mathematica cannot find square roots of some matrices? It allows you to run multiple terminals from a single session. You've successfully subscribed to Linux Handbook. However, we can restore it with the following keyboard shortcuts: We can take things even a step further. Lock-screen command? Dave is a Linux evangelist and open source advocate. For example, you may log in via SSH to a remote server and perform some tasks there. Lock screen from command line; Lock screen from command line. Can we keep alcoholic beverages indefinitely? Ctrl+a+d [detached] You can also use - d option if you want to logout and detach the screen from another terminal. The man page runs to over 4,100 lines. linux networking 1) linux ifconfig 2) linux ip linux telnet command ssh linux linux mail command 3) linux traceroute 4) linux tracepath 5) linux ping 6) linux netstat 7) linux ss 8) linux dig 9) linux nslookup 10) linux route 11) linux host 12) linux arp 13) linux iwconfig 14) linux hostname 15) linux curl & wget linux curl command 16) linux mtr Once you've typed your password, you won't see the password until you click Enter; you can also set a password by clicking Reset. This gives us both live outputs in one split window. You can use the process ID (PID) to access the desired screen just like you would for a named session. The command is primarily used for modifying user accounts in Linux. Because we closed our one and only detached window, we get a message that screen is terminating. Like most things on linux, they can also be customized. Well download the source code for the latest Linux kernel and redirect it into a file called latest_kernel.zip. To adjust the time it takes for the lock screen to automatically pop up, start by opening the application launcher and navigating to System Settings. Go to System Settings -> Brightness and Lock. Next, we run the df command to check file system usage: When we see df running, we hit Ctrl+A andthe pipe character (|). Many thanks! During his career, he has worked as a freelance programmer, manager of an international software development team, an IT services project manager, and, most recently, as a Data Protection Officer. After we authenticate on the remote computer and log in, we type the following to start a screen session called ssh-geek: For demonstration purposes, well runtopin the screen window, but you could start any long-running or endless process. My work as a freelance was used in a scientific paper, should I be included as an author? Now you should have understood how to use the screen command and take advantage of multiple terminal sessions in Linux. The screen command with -ls flag shows all the screen sessions on the system. Should you consider using screen to improve your workflow? would be great too), but I can only dig things up for GDM and XScreensaver. 1. Perform a quick search across GoLinuxCloud. For any other feedbacks or questions you can either use the comments section or contact me form. Dave McKay first used computers when punched paper tape was in vogue, and he has been programming ever since. To verify the change, use the screen -ls command. Ctrl+a and p: switch to the previous window. To do this, use the command Ctrl-a followed by x (Note that it is the lowercase character). rev2022.12.11.43106. You can press the Space bar to read the second page or Enter to return to the command prompt. 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Have you searched RedHat knowledgebase for known bugs against gnome-screensaver? You type Ctrl+A, release those keys, and then press d to detach the screen. Next, we press Ctrl+A and 0 to display the dmesg window. You can easily view all the keyboard shortcuts from the system Settings utility. Enter y to exit the session. Lets get rid of it and stop it from running. Ctrl-a + [: It start the copy mode. There are a ton of possibilities to explore. You can initialize the shell by using [ctrl + a] + c. There are more keyboard shortcuts essential for managing and navigating terminal windows: Feel free to create your own arrangement and explore. RELATED: How to Use curl to Download Files From the Linux Command Line. How to transfer files over SSH with SSHFS in Linux & Windows, Didn't find what you were looking for? You Can Get a Year of Paramount+ for $25 (Again), Intel Arc GPUs Now Work Better With Older Games, How to Watch UFC 282 Blachowicz vs Ankalaev Live Online, What Is Packet Loss? To lock a folder, right-click it and select Lock Folders. To detach from the screen press the following keys in sequence: Ctrl+a+d To reattach to the screen type the command: $ screen -r More information is available in the manual pages visible by typing the command: $ man screen With screen, you can disconnect from the terminal session and reconnect again to resume where you left it. I appreciate. At the same time, you may want to keep a tab on the RAM and CPU utilization on the server while doing work on the local system. You will need to specify the screen ID . What Is a PEM File and How Do You Use It? You can use this name to reattach the session later. Ubuntu 16.04 or newer). Lock Linux Terminal Screen The screen also has a shortcut to lock the screen. To delete the previously locked file, click the "Home" tab in the toolbar, followed by "Delete.". At the new command prompt, we type the following: The vmstat output appears and updates every two seconds. Top will continue to run in the background, but I am taken back to the screen application. Many thanks! You can use these commands to install screen according to your Linux distros. For this instance, Ive created one called top (dont confuse it with the command top, it could be named anything). to stay connected and get the latest updates. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. With the Linux screen command, you can push running terminal applications to the background and pull them forward when you want to see them. Youre returned to your previous terminal window, which will still show the command you used to reattach the window. Ctrl-a + |: It split the current windows vertically. Should you consider using screen to improve your workflow? It also supports split-screen displays and works over SSH connections, even after you disconnect and reconnect! But not asking password at the unlock time. In Ubuntu 18.04, you can use the Super+L shortcut to lock your computer screen. One of the most common Linux networking commands is traceroute. The existing messages appear. When the session is detached, the process that was originally started from the screen is still running and managed by the screen itself. It only takes a minute to sign up. Lock the current seat. Received a 'behavior reminder' from manager. 20+ lshw command examples in Linux [Cheat Sheet], Journalctl cheat sheet with 10+ commands to filter systemd logs, 5 pvcreate command examples in Linux [Cheat Sheet], 15+ SSH command examples in Linux [Cheat Sheet], How to transfer files over SSH with SSHFS in Linux & Windows. 2 Answers. If you are new to this, leave us a comment and let us know if you enjoyed the tutorial. 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. - user3134198 Jan 28, 2014 at 10:33 No one asked for gnome, i use DWM, so I need a proper command for terminal - holms How to Check If Your Server Is Vulnerable to the log4j Java Exploit (Log4Shell), How to Pass Environment Variables to Docker Containers, How to Use Docker to Containerize PHP and Apache, How to Use State in Functional React Components, How to Restart Kubernetes Pods With Kubectl, How to Find Your Apache Configuration Folder, How to Assign a Static IP to a Docker Container, How to Get Started With Portainer, a Web UI for Docker, How to Configure Cache-Control Headers in NGINX, How Does Git Reset Actually Work? Hi when I logged as a ordinary user then Ctrl + Alt + L locks the screen and also at the time of unlock asks for a password, but when I logged in as a root it locked the screen but didn't asked for a password. You can press the " Ctrl-A " and " x " shortcuts to lock the screen. To lock the user, you can use the -L option in this manner: usermod -L user_name. Instead, you will hit [ ctrl + a ] and then the specified key. 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