LPIC-1 Administrative Tasks Practice Question
Which command schedules a job to run once at 2:30 PM today?
⚠ Common exam trap
Test-takers frequently confuse the `at` time separator (colon) with the period used in some other contexts, or mistakenly think `crontab` can schedule one-time jobs, leading them to choose option A or C.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
at 14:30
The `at` command schedules a one-time job for a specified time. The correct syntax uses a colon (:) to separate hours and minutes, as in `at 14:30`, which schedules the job for 2:30 PM today. Option D is correct because it follows the standard `at` time format.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
crontab -e
Why it's wrong here
Edits the user's crontab for recurring jobs, not one-time scheduling.
- ✗
batch
Why it's wrong here
Schedules a job to run when system load is low, not at a specific time.
- ✗
at 14.30
Why it's wrong here
The time separator must be a colon, not a dot.
- ✓
at 14:30
Why this is correct
The 'at' command with a time in 24-hour format schedules a one-time job at that time.
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