crontab syntax in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to schedule a job to run every minute.

Linux CLI

* * * * [1] /path/to/script.sh

Drag options to blanks, or click blank then click option'

A?

B/

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '/' or '-' in the day of week field without proper context.

Leaving the field empty.

The last field in crontab is the day of the week. Using '*' means every day of the week.

2fill in blank

medium

Complete the code to schedule a job to run at 3:30 AM every day.

Linux CLI

[1] 3 * * * /path/to/script.sh

Drag options to blanks, or click blank then click option'

A30

B0

C3

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping minutes and hours.

Using '*' instead of specific numbers.

The first field is minutes. To run at 3:30 AM every day, minutes should be 30 and hours 3. The blank is for minutes, so fill it with 30. The full crontab entry is '30 3 * * * /path/to/script.sh'.

3fill in blank

hard

Fix the error in the crontab line to run a job every 5 minutes.

Linux CLI

*/[1] * * * * /path/to/script.sh

Drag options to blanks, or click blank then click option'

A5

B0

C*/5

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Putting '*/5' inside the blank, which duplicates the '*/' prefix.

Using 0 or 1 which do not mean every 5 minutes.

To run a job every 5 minutes, use '*/5' in the minutes field. Since the code already has '*/{{BLANK_1}}', the blank should be '5' to form '*/5'.

4fill in blank

hard

Fill both blanks to schedule a job to run at 2:15 PM on weekdays (Monday to Friday).

Linux CLI

15 [1] * * [2] /path/to/script.sh

Drag options to blanks, or click blank then click option'

A14

B13

C1-5

D0-6

Attempts:

3 left

💡 Hint

Common Mistakes

Using 2 instead of 14 for hour.

Using 0-6 for weekdays instead of 1-5.

The hour field for 2 PM is 14 (24-hour clock). The day of week field for Monday to Friday is '1-5'.

5fill in blank

hard

Fill all three blanks to schedule a job to run at 11:45 PM on the 1st day of every month in January, March, and May.

Linux CLI

[1] [2] [3] 1,3,5 * /path/to/script.sh

Drag options to blanks, or click blank then click option'

A45

B23

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 11 instead of 23 for hour.

Using 0 for day of month instead of 1.

Minutes is 45, hour is 23 (11 PM), day of month is 1.