This guide is about the How to Log Off Another Users ssh Connection by Command Line in Mac OS or Linux. I will try my best so that you understand this guide very well. I hope you all like this guide How to Log Off Another Users ssh Connection by Command Line in Mac OS or Linux.
Using SSH or Secure Shell is a very common way to establish remote connections to Macs and Linux machines from the command line. If you’re an administrator, or if SSH is enabled on your Mac for some other reason, you may end up logging out of another user’s ssh connection. There are several ways to end users’ ssh connection to a Mac (or Linux box, these tips also apply there), and we’ll cover a few of them.
Note that these approaches log out of the user’s ssh connection, regardless of how you enabled SSH on the computer. Whether a Mac enables ssh with a remote ID or enables ssh on the command line is irrelevant for these purposes. Similarly, these tricks are written for MacOS and Mac OS X, but they apply equally to terminating ssh user processes on Linux and most other Unix flavors.
How to log out of a user’s ssh connection
Perhaps the most common way to log out of a user connected through ssh is to use kill or pkill commands, either by targeting that ssh process or directly to the user account.
Logging out of the ssh user with killilla
First, get the process ID (PID) of the users’ ssh connection:
ps aux | grep sshd
Next, find a specific process for the target users’ ssh connection and target it with kill – For example, suppose we want to end a user’s Walrus ssh connection and the PID of the ‘sshd: Walrus @ ttys011’ process is 5821:
to kill -9 5821
The effect is immediate and towards the end of the users they see a message on the screen of the terminal: “The connection to the local host is closed via the remote host. The connection to the local host is closed.”
Extending the SSH connection of users and related processes extensively with pkill
Another broader approach is to kill all processes in a particular user account with pkill, allowing you to target only the user account instead of the process ID:
pkill -u username
This immediately logs the user’s ‘username’ off, terminating all such user processes.
The Pkill approach is useful because it also accepts wildcards and you can also easily target a process by name if you want to stop all ssh processes, for example.
There are other possibilities to end another user’s ssh connection, but the tricks above are perhaps the most intuitive for conscious command line users. Basically, any method that allows you to see ongoing processes and search for expected user ssh connections works to achieve the same effect; Stopping this process will result in the user logging out of ssh.
SSH user logout from Mac using Activity Monitor
If you’re a Mac user who wants to stay in the UI, you can also use Activity Monitor to locate a task and end it this way, just like you would force you to quit Mac apps in general. Simply open Activity Monitor, locate ssh, and locate the users ssh connection you want to end, and then end the process through Activity Monitor.
Because this approach uses Activity Monitor, a native Mac utility, this method obviously doesn’t work on Linux machines because they don’t have that utility, while any other approach to process targeting would work.
And just in case you think, yes, this would all work basically the same way with telnet, screen sharing, or any other remote connection method by targeting those relevant processes that are specifically related to the logged in user account.
If you know of other ways or ways to log out of a user’s ssh connections or disconnect users from a ssh, please share with us in the comments below!
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