Interpret the crontab line: 3 */1 * 3 6 wall hi. Which statement is true?

• A. The command will run at minute 3 of every hour on Saturdays in March.
• B. The command will run at minute 3 on all days of March.
• C. The command will run at hour 3 on Saturdays in March.
• D. The command will run at minute 3 on Saturdays in November.

Answer: (A)

In cron, the five time fields specify when the command should run: minute, hour, day of month, month, and day of week, followed by the command. Interpreting the line:

• minute is 3 → run at the 3rd minute of each hour.

• hour is */1 → every hour (0 through 23).

• day of month is * → any day of the month.

• month is 3 → March.

• day of week is 6 → Saturday (with 0 or 7 typically Sunday, 1 Monday, etc.).

Since the day-of-week field is specifically Saturday and the day-of-month field is a wildcard, the job runs on Saturdays in March. Put together, this means at minute 3 of every hour on Saturdays in March, the command wall hi will execute (e.g., 00:03, 01:03, …, 23:03 on Saturdays in March).