The -u (user) option lets us tell ps to restrict its output to the processes running under the ownership of that user account. We can use the ps command to list the processes this user is running. The who command will list active sessions. Let’s see if he really is logged in and, if he is, how many sessions he’s working with. As soon as you give the nod to security he’s going to be escorted from the building.Įverything’s set.
At this moment he is unaware of this, he’s still working, and logged in. In our scenario, we’ll pretend that a user, Eric, has done something that warrants his immediate removal from the premises. That gives the system administrator very little time to plan, and an urgency to get the account locked, closed and deleted-with a copy of the user’s files backed up in case they are needed for any post-closure forensics. Such events usually happen suddenly, with little fore-warning. The worst-case scenario is when someone leaves under a cloud because of a misdemeanor. At the conclusion of the project, the system administrator has to perform the housekeeping and remove unnecessary accounts. Team-ups are common in academia, where research projects can span departments, different universities, and even commercial entities. The account might have been set up for a short term collaboration with a visitor from another company. A staff member might be moving to a different team or leaving the company altogether. There’s any number of reasons an account might need to be deleted. If you’re the system administrator that responsibility falls to you. On Linux, there’s a sequence of steps that should be followed in order to correctly and methodically remove the user, their files, and their account from the computer. They need to be removed when that access is no longer required. They need to be created when the user first needs access to the computer. User accounts have an administrative overhead. And so user accounts- and passwords-were born. Ever since the first time-sharing systems appeared in the early 1960s and brought with them the capability for multiple users to work on a single computer, there’s been a need to isolate and compartmentalize the files and data of each user from all the other users.
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