Use w command to see logged in users in Linux 2. Check who is logged in with who command 3. Just get logged in users with users command 4. Using finger command to see logged in users Have you ever been curious about who is logged in to your Linux system?
One source stated Using finger command to see logged in users You may need to install finger command first because not all Linux distributions have it installed by default. It is available in the universe repository of Ubuntu and you can install it with this command:.
You can log-out the user by sending the KILL signal to the user-process with: Note (kudos to pbhj): If you get locked in a console, use Ctrl + Alt + F7 to get back to the GUI. Show activity on this post. Thanks for contributing an answer to Ask Ubuntu!
5.4.2 Ensure system accounts are non-login (Scored) Profile Applicability. There are a number of accounts provided with Ubuntu that are used to manage applications and are not Rationale. It is important to make sure that accounts that are not being used by regular users are prevented from being Audit. More, and remediation are a couple extra ideas to examine.
Is it possible to list all users on a Linux system?
You can always list all the users on your Linux system but not all of them would be logged in all the time. If you are on a multi-user Linux environment like a Linux server, checking logged in users could be useful and fun at the same time.
Non-system users need not be listed there. You can get the list using getent and awk ignoring “nobody” (also a convention): Show activity on this post.
Every user on a Linux system, whether created as an account for a real human being or associated with a particular service or system function, is stored in a file called ” /etc/passwd “. The “/etc/passwd” file contains information about the users on the system. Each line describes a distinct user. Have a look by entering:.
In Ubuntu it is usually /bin/bash, but it is not a rule. So you can try: Also usually real users home folder located in /home. You can try: There is also a file /etc/shadow, where in second column encrypted users passwords.
Why can’t I run commands from my Ubuntu nologin account?
By default, Ubuntu sets the password field for these accounts to an invalid string, but it is also recommended that the shell field in the password file be set to /sbin/nologin. This prevents the account from potentially being used to run any commands. Run the following script and verify no results are returned :.
The problem is that you are trying to “su” into a user that does not have a shell assigned to it. Most of the users such as mysql, pulse, etc, created by the system or by some packages when you install software does not have a shell assigned.
What does Sudo do in Linux?
The sudo command is used to run a command with elevated privileges, in most times as root but it can also be used to run commands as some other user, not necessarily a root user or super user.
If you install your Ubuntu 20.04 system or any previous version for the first time, you’ll have a default user with an account of type administrator which can execute sudo. If you create any other users at a later point, you can use the sudo visudo command to add them to the sudoers group.
After saving and exiting the /etc/sudoers file with Ctrl+S and Ctrl+X, next, go ahead and try to run the sudo apt command or one of its sub-commands — you will not be prompted for a password. Now, what if you want to run all commands that require sudo without a password?
How do I run systemctl without a password in Linux?
To do so you need to edit the /etc/sudoers sudo configuration command using the sudo visudo editor. For example to allow a single user eg. Linuxconfig to execute the systemctl and reboot commands without sudo password add the following line into the /etc/sudoers configuration file :.