Repeating while a numeric condition is true | LinuC Level 1 102 Exam original practice question

1.06.2Basic

Start n at 1.

Print and increment n while it is at most 3.

Which loop header is appropriate?

Hint 1: Focus on the requirement

Identify what must change and what must remain unchanged. Then choose the command whose scope matches that requirement.

Hint 2: Check each command's role

Separate commands that display information, change state, remove data, or affect a child process.

for [ "$n" -le 3 ]; do: Incorrect. for does not take a test command in this form.
while [ "$n" -le 3 ]; do: Correct. The test succeeds while n is less than or equal to 3.
case [ "$n" -le 3 ]; do: Incorrect. case performs pattern matching, not numeric iteration.
if [ "$n" -le 3 ]; do: Incorrect. if uses then and fi and does not repeat.

Detailed explanation

Incorrectfor [ "$n" -le 3 ]; do

Incorrect. for does not take a test command in this form.

Correctwhile [ "$n" -le 3 ]; do

Correct. The test succeeds while n is less than or equal to 3.

Incorrectcase [ "$n" -le 3 ]; do

Incorrect. case performs pattern matching, not numeric iteration.

Incorrectif [ "$n" -le 3 ]; do

Incorrect. if uses then and fi and does not repeat.

An example you can run in a temporary verification environment.

sh -c 'n=1; while [ "$n" -le 3 ]; do printf "%s\n" "$n"; n=$((n + 1)); done'

1、2、3を1行ずつ表示

Foundation review

Check whether the command acts on the current shell, a new process, an existing process, or a file.

Use the supplied command and compare the output with the expected result.

Question IDKL-102-922

EnvironmentPOSIX sh / 状態変更なし

Last technical review2026-08-13