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Identify the error in this command: cat file.txt | | grep "error"

medium📝 Debug Q14 of 15
Linux CLI - Pipes and Redirection
Identify the error in this command: cat file.txt | | grep "error"
ANo error, command runs fine
BExtra pipe operator causes syntax error
Cgrep command is misspelled
DMissing filename after cat
Step-by-Step Solution
Solution:

  1. Step 1: Analyze the pipe usage

    The command has two pipe operators | | consecutively, which is invalid syntax.

  2. Step 2: Understand correct pipe usage

    Only one pipe operator should separate commands; extra pipes cause errors.

  3. Final Answer:

    Extra pipe operator causes syntax error -> Option B

  4. Quick Check:

    Double pipes cause syntax error [OK]
Quick Trick: Use single | between commands, no doubles [OK]
Common Mistakes:
  • Ignoring extra pipe and expecting output
  • Thinking missing filename is the error
  • Assuming grep is misspelled

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