[Solved] Why does nohup not protect a process from being killed by kill -9? — Ans: Because SIGKILL cannot be caught or ignored by any process | Linux CLI

Linux CLI - Process Management

Why does nohup not protect a process from being killed by kill -9?

ABecause nohup only works for background processes

BBecause nohup only works for shell scripts

CBecause kill -9 sends SIGHUP which nohup blocks

DBecause SIGKILL cannot be caught or ignored by any process

Step-by-Step Solution

Solution:

Step 1: Understand signals and their behavior
kill -9 sends SIGKILL, which immediately terminates a process.
Step 2: Check nohup limitations
SIGKILL cannot be caught, blocked, or ignored by any process, including those run with nohup.
Final Answer:
SIGKILL cannot be caught or ignored by any process -> Option D
Quick Check:
SIGKILL always kills, nohup can't block it [OK]

Quick Trick: SIGKILL (kill -9) always kills, nohup can't block it [OK]

Common Mistakes:

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Why does nohup not protect a process from being killed by kill -9?