Cron(ie) Tab Review

Question 1

Edit crontab entries for the root user

Answer 1

sudo crontab -e

Question 2

crontab -u Robert -l

Answer 2

View crontab entries for the user Robert

Question 3

Interpret the following crontab format:

15 5 * * 0 /path/to/script.sh

Answer 3

Run script.sh file at 5:15am on Sundays

Question 4

Set script24.sh to run every 4 days at 2 am

Answer 4

0 2 */4 * * /path/to/script24.sh

Question 5

Interpret the following crontab format:

0 0-2 * * 7 /path/to/script07.sh

Answer 5

Run script07.sh from 12am to 2 am on Sundays

Question 6

Interpret @monthly /path/to/script12.sh

Answer 6

Run script12.sh at 12 am monthly on the first day of the month

Question 7

Run script48.sh on the 5th day of January, April, July and October at 11:59 pm

Answer 7

59 23 05 jan,apr,jul,oct * /path/to/script48.sh

Question 8

Interpret the following crontab format:

”* * * * * “ /path/to/script2.sh

Answer 8

Run script2.sh every minute of every day

Question 9

Run script10.sh every 2 hours from Wednesday to Saturday every week

Answer 9

00 */2 * * 3-6 /path/to/script10.sh

Question 10

Run script8.sh every hour

Answer 10

0 * * * * path/to/script8.sh

-OR-

@hourly /path/to/script8.sh

Question 11

Run script12.sh at 12 am monthly on the first day of the month

Answer 11

• @monthly /path/to/script12.sh
• interpret 0 0 1 * * /path/to/script4.sh
• ”* 0 1 * * “ /path/to/script4.sh

Question 12

0 2 4 * * /path/to/script24.sh

Answer 12

Set script24.sh to run on the 4th day of every month at 2 am