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Why does this command fail?

medium📝 Debug Q7 of 15
Bash Scripting - Text Processing in Scripts
Why does this command fail?
echo "abc" | tr 'a-z'
Atr does not accept piped input
BInput string is empty
CMissing second set of characters for translation
DQuotes are incorrect
Step-by-Step Solution
Solution:

  1. Step 1: Check tr syntax requirements

    tr requires two sets of characters for translation: source and target.

  2. Step 2: Analyze the command

    Only one set 'a-z' is provided, so the command fails due to missing second set.

  3. Final Answer:

    Missing second set of characters for translation -> Option C

  4. Quick Check:

    tr needs two sets = missing second set causes failure [OK]
Quick Trick: Always provide two sets for translation in tr [OK]
Common Mistakes:
MISTAKES
  • Providing only one set
  • Thinking tr rejects piped input
  • Incorrect quotes causing failure

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