Removing carriage-return characters | LinuC Level 1 101 Exam original practice question

1.03.2Basic

Remove CR (carriage return, \r) from CRLF input.

Keep LF (\n) line breaks and write the result to standard output.

Which tr command is appropriate?

Hint 1: Focus on the requirement

Delete only the carriage-return byte while preserving line-feed bytes.

Hint 2: Key terms

Review the short stream-processing definitions before comparing the choices.

Detailed explanation

Incorrecttr '\r' '\n'

Incorrect. Replacing CR with LF would add an extra line break.

Incorrecttr -d '\n'

Incorrect. Deleting LF would remove the line separators.

Incorrecttr -s '\r'

Incorrect. -s squeezes repeated characters but does not remove CR.

Correcttr -d '\r'

Correct. tr -d '\r' deletes CR while preserving LF.

An example you can run in a temporary verification environment.

printf 'one\r\ntwo\r\n' | tr -d '\r' | od -An -tx1

各行末が0aだけで、0dを含まない16進列

Foundation review

Removing CR from CRLF input leaves LF line endings suitable for Unix text tools.

Inspect the bytes before and after with a disposable sample.

Question IDKL-101-463

EnvironmentGNU coreutils 9.x / 標準入力

Last technical review2026-08-13

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