Why process control manages running programs in Linux CLI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the command to list all running processes.

Linux CLI

ps [1]

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

A-z

B-l

C-a

D-x

Attempts:

3 left

💡 Hint

Common Mistakes

Using -z which is not a valid option.

Using -l which shows detailed info but not all processes.

Using -a which shows processes with terminals only.

The ps -x command lists all running processes including those without a controlling terminal.

2fill in blank

medium

Complete the command to stop a running process by its PID.

Linux CLI

kill [1]

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

A1234

B-1

C-9

D-5

Attempts:

3 left

💡 Hint

Common Mistakes

Using a signal option like -9 without a PID.

Using a signal option instead of the PID.

Not providing any argument.

The kill command followed by the process ID (PID) stops that process. Here, 1234 is an example PID.

3fill in blank

hard

Fix the error in the command to run a program in the background.

Linux CLI

[1]myscript.sh &

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

Astart

B./

Crun

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'run' or 'start' which are not valid commands.

Omitting the ./ prefix causing 'command not found'.

To run a script in the background, prefix it with ./ if it's in the current directory.

4fill in blank

hard

Fill both blanks to show the process tree with all processes.

Linux CLI

pstree [1] [2]

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

A-p

B-a

C-A

D-u

Attempts:

3 left

💡 Hint

Common Mistakes

Using options that don't show PIDs or arguments.

Using only one option instead of both.

The pstree -p -a command shows the process tree with PIDs and command line arguments.

5fill in blank

hard

Fill all three blanks to create a dictionary of running processes with PID as key and command as value.

Linux CLI

processes = [1]: [2] for [3] in $(ps -e -o pid=,comm=)}}

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

Apid

Bline

Cline.split()[0]

Dline.split()[1]

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names not defined in the loop.

Not splitting the line to separate PID and command.

This code splits each line from ps output to get PID and command, then creates a dictionary.