What command is used to terminate a process? A. kill B. cancel C. haltsys D. shutdown E. None of the above

The correct answer is A. kill.

The kill command is used to send a signal to a process, which can cause the process to terminate. The signal can be a SIGTERM, SIGKILL, or SIGSTOP signal. The SIGTERM signal is a polite way to tell a process to terminate. The SIGKILL signal is a more forceful way to terminate a process, and the SIGSTOP signal causes a process to stop running but does not terminate it.

The cancel command is used to cancel a job that is running in the background. The haltsys command is used to halt the system. The shutdown command is used to shut down the system.

Here are some examples of how to use the kill command:

• To send a SIGTERM signal to a process with the process ID (PID) of 1234, you would use the following command:
  kill -TERM 1234
• To send a SIGKILL signal to a process with the PID of 1234, you would use the following command:
  kill -KILL 1234
• To send a SIGSTOP signal to a process with the PID of 1234, you would use the following command:
  kill -STOP 1234

For more information on the kill command, you can refer to the man page for kill.