Appending output to an existing log | LinuC Level 1 101 Exam original practice question

1.03.3Basic

Append check-status standard output to the end of history.log.

Keep the existing log contents.

Which redirection is appropriate?

Hint 1: Focus on the requirement

The existing log must remain intact, so use append redirection.

Hint 2: Key terms

Review the short stream and redirection definitions before comparing the choices.

Append redirection: A shell connection that writes after existing file contents.
Append operator: The shell symbol used to append standard output.
File descriptor: A number identifying an open input or output stream.
Log append: Adding new records to the end of an existing log.

Detailed explanation

Incorrectcheck-status > history.log

Incorrect. > truncates the existing log.

Correctcheck-status >> history.log

Correct. >> appends standard output to history.log.

Incorrectcheck-status 2>> history.log

Incorrect. 2>> appends standard error, not standard output.

Incorrectcheck-status < history.log

Incorrect. < supplies history.log as standard input.

An example you can run in a temporary verification environment.

tmp=$(mktemp); printf 'old\n' >"$tmp"; printf 'new\n' >>"$tmp"; cat "$tmp"; rm -f "$tmp"

old
new

Environment: Bash 5.x / 一時ファイル
Use temporary files and harmless commands for stream experiments.
Shell redirection syntax and xargs behavior should be checked on the target shell implementation.

Foundation review

Appending differs from overwrite because the destination is not truncated first.

Run two small commands and verify that both lines remain in the temporary log.

Question IDKL-101-467

EnvironmentBash 5.x / 一時ファイル

Last technical review2026-08-13

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