Common cron expressions 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*

B0

C1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using '0' in the last field runs only on Sunday.

Using '1' or '5' restricts the job to specific weekdays.

The last field in a cron expression is the day of the week. Using '*' means every day of the week, so the job runs every minute of every day.

2fill in blank

medium

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

Linux CLI

0 [1] * * * /path/to/script.sh

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

A0

B23

C3

D12

Attempts:

3 left

💡 Hint

Common Mistakes

Setting hour to 0 runs at midnight, not 3 AM.

Using 12 runs at noon, not 3 AM.

The second field is the hour. Setting it to '3' means the job runs at 3 AM.

3fill in blank

hard

Fix the error in the cron expression to run a job every Sunday at midnight.

Linux CLI

0 0 * * [1] /path/to/script.sh

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

A*

B7

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' runs the job every day, not just Sunday.

Using '1' runs the job on Monday.

In cron, Sunday can be represented as 0 or 7. Using '0' is standard and avoids confusion.

4fill in blank

hard

Fill both blanks to schedule a job to run every 15 minutes between 9 AM and 5 PM on weekdays.

Linux CLI

[1] 9-17 * * [2] /path/to/script.sh

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

A*/15

B0

C1-5

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' in minutes runs every minute, not every 15 minutes.

Using '0' in day of week runs only on Sunday.

Using '*/15' in the minutes field runs the job every 15 minutes. '1-5' in the day of week field means Monday to Friday.

5fill in blank

hard

Fill all three blanks to schedule a job to run at 30 minutes past every hour from 8 AM to 10 AM on the 1st and 15th of each month.

Linux CLI

[1] [2] 1,15 * [3] /path/to/script.sh

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

A30

B8-10

C*

D1-5

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' in hours runs every hour, not just 8 to 10.

Using '1-5' in day of week restricts to weekdays, which is not needed here.

The minutes field is '30' for 30 minutes past the hour. The hour field is '8-10' for 8 AM to 10 AM. The day of week field is '*' to run on any day of the week since days are restricted by day of month.