nohup for persistent processes in Linux CLI - Mini Project: Build & Apply

Using nohup for Persistent Processes

📖 Scenario: You want to run a command on a Linux server that keeps running even if you close your terminal or get disconnected. This is useful when running long tasks like backups or downloads.

🎯 Goal: You will learn how to use the nohup command to run a process that stays alive after you log out. You will also learn how to check the output and confirm the process is running.

📋 What You'll Learn

Create a simple command that runs for a while

Use nohup to run the command persistently

Redirect output to a file

Check the output file to see the command's result

💡 Why This Matters

🌍 Real World

System administrators and developers often need to run scripts or commands that take a long time. Using <code>nohup</code> ensures these tasks keep running even if the terminal closes.

💼 Career

Knowing how to run persistent processes is essential for managing servers, running backups, or deploying applications in real environments.

1

Create a simple long-running command

Write a command that uses sleep 30 to pause for 30 seconds.

Linux CLI

# Type the command to sleep for 30 seconds
# Your code here

Need a hint?

The sleep command pauses the terminal for the number of seconds you specify.

2

Run the command with nohup to keep it running after logout

Use nohup before the command sleep 30 and redirect output to a file called output.log.

Linux CLI

nohup sleep 30 > output.log 2>&1 &
# Your code here

Need a hint?

nohup runs the command immune to hangups. Redirect output to output.log and run in background with &.

3

Check the output file for command result

Use cat output.log to display the contents of the output file.

Linux CLI

# Display the contents of output.log
cat output.log
# Your code here

Need a hint?

The cat command shows the contents of a file.

4

Confirm the process is running with ps

Use ps aux | grep sleep to check if the sleep 30 process is running.

Linux CLI

# Check running processes for sleep
ps aux | grep sleep
# Your code here

Need a hint?

The ps aux command lists running processes. Use grep to filter for sleep.