What does the cron expression 0 12 * * * do?

easy📝 Conceptual Q1 of 15

Linux CLI - Cron and Scheduling

What does the cron expression 0 12 * * * do?

ARuns a job every hour at minute 12

BRuns a job every day at 12:00 PM (noon)

CRuns a job every 12 minutes

DRuns a job every 12 hours

Step-by-Step Solution

Solution:

Step 1: Understand the cron fields
The fields are: minute, hour, day of month, month, day of week. Here, minute=0, hour=12, others are * (any).
Step 2: Interpret the expression
This means the job runs when minute is 0 and hour is 12, every day, every month, any day of week.
Final Answer:
Runs a job every day at 12:00 PM (noon) -> Option B
Quick Check:
Cron expression meaning = Runs daily at noon [OK]

Quick Trick: Minute and hour fields define exact time, * means every [OK]

Common Mistakes:

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