[Solved] Why does the command ps -ef | grep produce an error? — Ans: Because grep requires a search pattern argument | Linux CLI

Linux CLI - Process Management

Why does the command ps -ef | grep produce an error?

ABecause <code>grep</code> cannot be used with <code>ps</code>

BBecause <code>ps -ef</code> is an invalid option

CBecause the pipe symbol is misplaced

DBecause <code>grep</code> requires a search pattern argument

Step-by-Step Solution

Solution:

Step 1: Analyze the command
ps -ef lists all processes; piping to grep filters output.
Step 2: Identify the error
grep requires a pattern to search for; missing pattern causes error.
Final Answer:
A -> Option D
Quick Check:
grep needs a pattern [OK]

Quick Trick: grep always needs a pattern argument [OK]

Common Mistakes:

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Why does the command ps -ef | grep produce an error?