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Most people don't understand the knowledge points of this article "How to use vlock to lock terminals in Linux", so Xiaobian summarizes the following contents for everyone. The contents are detailed, the steps are clear, and they have certain reference value. I hope everyone can gain something after reading this article. Let's take a look at this article "How to use vlock to lock terminals in Linux".

The Linux vlock command is used to lock virtual terminals. Execute the vlock(virtual console lock) command to lock the virtual terminal from others.

Install Vlock

On Arch-based systems, the Vlock package has been replaced with the default preinstalled kpd package, so you don't have to worry about installation.

On Debian, Ubuntu, Linux Mint, run the following command to install Vlock:

$ sudoapt-get install vlock

On Fedora:

$ sudo dnf install vlock

On RHEL, CentOS:

$ sudoyum install vlock

The general syntax for Vlock is:

vlock [-acnshv ][-t ][ plugins...]

Here:

a --Lock all virtual console sessions, c --Lock current virtual console session, n --Switch to new empty console before locking all sessions, s --Disable SysRq key mechanism, t --Specify timeout for screensaver plug-ins, h --Show help, v --Show version.

Let me give you a few examples.

Lock the current console session

When Vlock is run without any parameters, it locks the current console session (TYY) by default. To unlock the session, you need to enter the password of the current user or the root password.

$ vlockVlock for shared Linux systems with multiple user access consoles Vlock for shared Linux systems with multiple user access consoles

You can also use the-c flag to lock the current console session.

$ vlock -c

Note that this command locks only the current console. You can press ALT+F2 to switch to another console. For more details on switching between TTY, see the following guide.

In addition, if the system has multiple users, other users can still access their own TTY.

Lock all console sessions

To lock all TTY's simultaneously and disable virtual console switching, run:

$ vlock -a

Similarly, to unlock a console session, simply press Enter and enter the password of the current user or the root password.

Remember that root can unlock any vlock session at any time unless disabled at compile time.

Switch to a new virtual console before locking all consoles

You can also cause Vlock to switch from an X session to a new empty virtual console before locking all consoles. To do this, use the-n flag.

$ vlock -n4, Disable SysRq mechanism

As you may know, the magic SysRq key mechanism allows users to perform certain actions when the system crashes. Therefore, users can unlock the console using SysRq. To prevent this, pass the-s option to disable the SysRq mechanism. Keep in mind that this option only applies when you have the-a option.

$ vlock -sa

For more options and how to use them, see Help or man pages.

$ vlock -h$ man vlock The above is about the content of this article on "How to use vlock to lock terminals in Linux". I believe everyone has a certain understanding. I hope that the content shared by Xiaobian will help everyone. If you want to know more related knowledge, please pay attention to the industry information channel.

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