Why process control manages running programs in Linux CLI - See It in Action

Why Process Control Manages Running Programs

📖 Scenario: Imagine you are working on a Linux system where multiple programs run at the same time. You want to understand how the system keeps track of these programs and controls their execution.

🎯 Goal: You will create a simple script that lists running programs and shows how process control helps manage them.

📋 What You'll Learn

Create a variable called process_list that stores the output of the ps -e command.

Create a variable called filter_keyword with the value bash.

Use a command to filter process_list for lines containing filter_keyword and store the result in filtered_processes.

Print the filtered_processes variable to show running bash processes.

💡 Why This Matters

🌍 Real World

System administrators and users often need to check which programs are running and control them to keep the system stable and efficient.

💼 Career

Understanding process control is essential for roles like system administration, DevOps, and IT support where managing running programs is a daily task.

1

Create a variable with the list of running processes

Create a variable called process_list that stores the output of the command ps -e.

Linux CLI

# Create a variable called process_list that stores the output of 'ps -e'
# Your code here

Need a hint?

Use $(command) to capture the output of a command into a variable.

2

Create a filter keyword variable

Create a variable called filter_keyword and set it to the string bash.

Linux CLI

process_list=$(ps -e)
# Create a variable called filter_keyword with the value 'bash'
# Your code here

Need a hint?

Use double quotes to assign a string value to a variable.

3

Filter the process list using the keyword

Use the grep command to filter process_list for lines containing filter_keyword. Store the result in a variable called filtered_processes.

Linux CLI

process_list=$(ps -e)
filter_keyword="bash"
# Filter process_list for lines containing filter_keyword and store in filtered_processes
# Your code here

Need a hint?

Use echo "$process_list" | grep "$filter_keyword" to filter lines.

4

Display the filtered running processes

Print the variable filtered_processes to show the running bash processes.

Linux CLI

process_list=$(ps -e)
filter_keyword="bash"
filtered_processes=$(echo "$process_list" | grep "$filter_keyword")
# Print the filtered_processes variable
# Your code here

Need a hint?

Use echo to display the contents of a variable.