Compressing with xz while keeping the input | LinuC Level 1 101 Exam original practice question

1.02.2Basic

Create large.log.xz from large.log.

Keep large.log after compression.

Which command is appropriate?

Hint 1: Focus on the requirement

Match the requested compression format and separately preserve the uncompressed input.

Hint 2: Key terms

Review the short command and filesystem definitions before comparing the choices.

xz: A command and compression format for creating or expanding .xz files.
Keep-input option: An option that leaves the input file after compression or decompression.
Decompress option: An option that expands compressed input.
Compression format: The representation used by gzip, bzip2, xz, and similar tools.

Detailed explanation

Incorrectgzip -k large.log

Incorrect. gzip creates a gzip file rather than an xz file.

Incorrectbzip2 -k large.log

Incorrect. bzip2 creates a bzip2 file rather than xz.

Correctxz -k large.log

Correct. xz -k large.log creates the compressed file and retains the input.

Incorrectxz -d large.log

Incorrect. -d requests decompression.

Try it yourself

An example you can run in a temporary verification environment.

tmp=$(mktemp -d); printf 'sample sample sample\n' >"$tmp/large.log"; xz -k "$tmp/large.log"; test -f "$tmp/large.log" && test -f "$tmp/large.log.xz" && echo both-exist; rm -rf "$tmp"

Expected result

both-exist

Key points

xz format
-k keeps input
-d decompresses

Notes

Environment: XZ Utils 5.x / 一時ファイル
Use disposable files and directories for destructive or timestamp-related checks.
Command details can vary slightly between GNU and non-GNU implementations.

Foundation review

Place the operation

The format determines the output suffix and decoder, while input retention is controlled by a separate option.

Check the side effect

Confirm that both the compressed output and original input exist after a disposable test.

Question IDKL-101-408

EnvironmentXZ Utils 5.x / 一時ファイル

Last technical review2026-08-13

Report an error or rights issue