at command for one-time jobs in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to schedule a command to run at 5 PM today using the at command.

Linux CLI

echo "ls -l" | at "[1]"

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

Atomorrow 5pm

B17:00

Cnow + 1 hour

D5pm

Attempts:

3 left

💡 Hint

Common Mistakes

Using '17:00' might not work as expected in all shells.

Using 'now + 1 hour' schedules the job one hour from now, not at 5 PM.

Using 'tomorrow 5pm' schedules the job for tomorrow, not today.

The at command accepts time in formats like '5pm' to schedule jobs for that time today.

2fill in blank

medium

Complete the code to schedule a script backup.sh to run at 10:30 AM tomorrow.

Linux CLI

at "[1]" -f backup.sh

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

A10:30 tomorrow

B10:30am tomorrow

Ctomorrow 10:30

Dnow + 1 day 10:30

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'tomorrow 10:30' might not be recognized correctly.

Using 'now + 1 day 10:30' is not a valid at time format.

Using '10:30 tomorrow' misses the AM/PM and may cause errors.

The at command accepts '10:30am tomorrow' to schedule a job at 10:30 AM the next day.

3fill in blank

hard

Fix the error in the command to schedule echo Hello to run at 2 AM tomorrow.

Linux CLI

echo "echo Hello" | at "[1]"

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

Atomorrow 2am

B2am tomorrow

C2:00 tomorrow

D2am

Attempts:

3 left

💡 Hint

Common Mistakes

Using '2am' alone schedules the job for 2 AM today if that time is in the future.

Using '2:00 tomorrow' is not a valid at time format.

Using '2am tomorrow' may cause errors depending on shell parsing.

The correct format is 'tomorrow 2am' to specify 2 AM the next day for the at command.

4fill in blank

hard

Fill both blanks to schedule a command to run 15 minutes from now and list all scheduled jobs.

Linux CLI

echo "date" | at "[1]" && at [2]

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

Anow + 15 minutes

B-l

C-c

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'list' instead of '-l' to list jobs causes errors.

Using 'now + 15' without 'minutes' schedules immediately or errors.

Using '-c' lists job contents but is not the standard list command.

Use 'now + 15 minutes' to schedule the job 15 minutes later, and 'at -l' to list all scheduled jobs.

5fill in blank

hard

Fill both blanks to schedule a job to run a script cleanup.sh at 11:45 PM today, then remove the job by its ID.

Linux CLI

at "[1]" -f cleanup.sh
job_id=$(atq | head -n 1 | cut -f1)
atrm [2]

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

A11:45pm

B$job_id

C1

Dnow + 1 hour

Attempts:

3 left

💡 Hint

Common Mistakes

Using '1' to remove the job may delete the wrong job.

Using 'now + 1 hour' schedules the job at the wrong time.

Not capturing the job ID before removing causes errors.

Schedule the job at '11:45pm' today, then remove it using the job ID stored in the variable job_id.