Which command interrupts and kills the current processes running in a session?

The command that interrupts and kills the current processes running in a session is "kill -9". This command sends the SIGKILL signal to a specified process, which forces it to terminate immediately, regardless of what it is doing. This is particularly useful in scenarios where a process is unresponsive or hanging, as it does not allow the process to clean up or perform any shutdown routines.

Using "kill -9" is a more aggressive method compared to the standard "kill" command, which sends a SIGTERM signal that requests a graceful termination. The "kill -9" command is often a last resort when other methods fail.

The other options do not serve the same purpose. The "exit" command is used to leave the current shell session but does not affect running processes. Similarly, "logout" is designed to exit from a login shell session and does not terminate background processes. "shutdown now" is intended to power off the system immediately, which would indeed stop all processes but is not focused on killing current processes in the context of the active user session. Thus, "kill -9" is the appropriate command for directly terminating processes.