Which of the following commands kills the process with the PID 123 but allows the process to "clean up" before exiting?
A
kill -PIPE 123
B
kill -KILL 123
C
kill -STOP 123
D
kill -TERM 123
Correta
Explicação Oficial / Explicações da Comunidade
The kill command sends a signal to a process. The default signal is SIGTERM (15), which requests the process to terminate gracefully, allowing it to clean up resources, close files, and perform shutdown routines. The command kill -TERM 123 sends SIGTERM to PID 123, enabling a clean exit.
How it Works:
SIGTERM (signal 15) is the standard way to politely ask a process to terminate. The process can catch this signal and execute cleanup handlers before exiting.
SIGKILL (signal 9) immediately terminates the process without any cleanup, which can lead to data loss or corruption.
SIGPIPE (signal 13) is typically sent when a process writes to a pipe with no reader; it is not intended for graceful termination.
SIGSTOP (signal 19) pauses the process; it cannot be caught or ignored, and the process remains in memory but does not execute.
