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Which of these times is valid to schedule a job with at?

easy📝 Conceptual Q2 of 15
Linux CLI - Cron and Scheduling
Which of these times is valid to schedule a job with at?
A25:00
B14:30
C99:99
D-1:00
Step-by-Step Solution
Solution:
  1. Step 1: Identify valid time format for at

    The at command accepts times in 24-hour format from 00:00 to 23:59.
  2. Step 2: Check each option

    14:30 is a valid time. 25:00, 99:99, and -1:00 are invalid times.
  3. Final Answer:

    14:30 -> Option B
  4. Quick Check:

    Valid time format = A [OK]
Quick Trick: Use 24-hour format between 00:00 and 23:59 [OK]
Common Mistakes:
  • Using invalid hour or minute values
  • Using negative times
  • Confusing AM/PM with 24-hour format

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