Permission types (read, write, execute) in Linux CLI - Mini Project: Build & Apply

Understanding Permission Types (read, write, execute) in Linux CLI

📖 Scenario: You are managing files on a Linux system. Each file has permissions that control who can read, write, or execute it. Understanding these permissions helps you keep files safe and control access.

🎯 Goal: You will create a file, set permissions, and check the permission types using Linux commands.

📋 What You'll Learn

Create a file named example.txt

Create a variable called permissions to store permission info

Use the ls -l command to get permission details

Print the permission types for the file

💡 Why This Matters

🌍 Real World

Managing file permissions is essential for protecting data and controlling access on Linux systems.

💼 Career

System administrators and developers often need to check and modify file permissions to secure systems and applications.

1

Create a file named example.txt

Use the touch command to create a file called example.txt.

Linux CLI

# Use the touch command to create example.txt
# Your code here

Need a hint?

Use touch example.txt to create an empty file named example.txt.

2

Create a variable called permissions to store permission info

Use the command ls -l example.txt and assign its output to a variable called permissions.

Linux CLI

touch example.txt
# Assign the output of ls -l example.txt to permissions
# Your code here

Need a hint?

Use permissions=$(ls -l example.txt) to save the file details into the variable.

3

Extract the permission types from permissions

Use the echo command with cut to extract the first 10 characters (permission string) from the permissions variable and save it to a variable called perm_types.

Linux CLI

touch example.txt
permissions=$(ls -l example.txt)
# Extract permission string and save to perm_types
# Your code here

Need a hint?

Use perm_types=$(echo "$permissions" | cut -c1-10) to get the permission characters.

4

Print the permission types for example.txt

Use echo to print the value of the variable perm_types.

Linux CLI

touch example.txt
permissions=$(ls -l example.txt)
perm_types=$(echo "$permissions" | cut -c1-10)
# Print the permission types
# Your code here

Need a hint?

Use echo "$perm_types" to display the permission string.