What does the command pkill -t pts/0 do?

• A. It kills all processes owned by the root user
• B. It kills all processes attached to terminal pts/0
• C. It cancels scheduled tasks on the terminal
• D. It kills all processes named pts/0

Answer: (B)

The key idea is that pkill can target processes by their controlling terminal. A terminal like pts/0 is a pseudo-terminal used by a login session. Any process started in that session has pts/0 as its controlling terminal. When you run the command with that terminal specified, pkill sends the terminate signal to every process whose controlling terminal is pts/0. In other words, it ends all activity in that specific terminal session. It won’t affect processes outside that terminal, and it won’t target a process by name or by user in this case. If you want to confirm what’s running there, you could list processes on that terminal with a command like ps -t pts/0.