Part $1$:

In this $2$ part lab, you will perform a series of tasks related to task scheduling using

crontab and at$,$ as well as managing background processes using fg$.$

Crontab Task Scheduling:

Objective: Schedule a task to automatically delete temporary files every Sunday at

$11$:$00$ PM$.$

Instructions:

Use crontab $-$e to open the crontab editor.

Add an entry to execute the command rm $-$rf $/$tmp$/*$ every Sunday at $11$:$00$ PM$.$

Save and exit the crontab editor.

At One$-$Time Task Scheduling:

Objective: Schedule a one$-$time task to print a reminder message in $30$ minutes.

Instructions:

Use the at command to schedule the printing of a reminder message in $30$ minutes.

Recurring Crontab Task:

Objective: Schedule a task to automatically update the system's package cache

every day at $3$:$00$ AM$.$

At One$-$Time Task Execution:

Objective: Schedule a one$-$time task to run a script named backup.sh tomorrow at

$8$:$00$ AM$.$

Foreground Process Management:

Objective: Start a long$-$running command or script in the background and bring it to

the foreground using fg$.$

Instructions:

Start a command $($e$.$g$.,$ ping$)$ in the background using &$.$

Use the jobs command to list background jobs and their IDs.

Bring the background job to the foreground using fg$.$

Scheduled Task Verification:

Objective: Verify that the scheduled tasks in crontab and at have been correctly set

up$.$

Instructions:

Use crontab $-$l to list the contents of your crontab and ensure that the scheduled

tasks are present.

Use atq to list the pending at jobs and confirm that the one$-$time task is scheduled.

Temporary Task Scheduling:

Objective: Schedule a one$-$time task to reboot the system in $10$ minutes using at$.$

Cleanup:

Objective: Remove all scheduled tasks and clean up background processes.

Instructions:

Remove all scheduled tasks from crontab using crontab $-$r$.$

Cancel all pending at jobs using atrm $$($atq $-$q$).$

Terminate any remaining background processes.

Notes:

Ensure that you replace $/$path$/$to$/$backup$.$sh with the actual path to the backup script

in Task $4.$

Verify the successful scheduling and execution of tasks using appropriate

commands $($crontab $-$l for crontab, atq for at$).$

Experiment with different background processes and tasks to gain familiarity with

process management command