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All LessonsFree Lessons (5)

Introduction to Bash

What is Shell?Introduction to Linux Getting Meta Information in Bash What is Bash?Introduction to Command Line Commands & Arguments (Optional)Getting Info about Commands Finding System Date and Time Other Commonly Used Bash Commands Quick Quiz!

Navigation Commands

Pathnames in Bash Symbolic Links & Hard Links Check the Current Directory in Bash Navigate between Directories Display Files in a Directory Create a Directory in Bash Remove a Directory in Bash Quick Quiz!

File Manipulation Commands

Create a File in Bash Remove a File in Bash Open/Display Content of a File Move Files in a Directory Copying Files in Bash Zipping a File in Bash Quick Quiz!

Permission Commands

What are Permissions?

Set/Remove Permissions in Bash

Filtering & Searching Commands

Searching in Bash Sorting File Contents in Order Viewing Beginning and Ending Contents of Files Filtering Repeated Lines Out Regular Expressions (Regex)GREP vs. EGREP vs. FGREP Quick Quiz!

System & Process Commands

Processes Jobs: How Do They Differ from Processes Getting Root Privileges Killing a Process Quick Quiz!

Variables and Environment

Variables and their Types Variable Assignment & Expansion Terminal is fun (Really)Caution: Cool Stuff Ahead!The Real Power of Bash How to Use Git with Bash Quick Quiz!

An Overview of Commands

Misc. Commands' Cheatsheet Final Quiz

Bash for Programmers/

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What are Permissions?

What are Permissions?

This lesson will tell you everything you need to know about permissions in GNU/Linux.

We'll cover the following...

In Linux, each file or directory follows certain set of rules and restrictions regarding who can access the file and change its content. These rules or access modes are commonly referred as permissions in Bash. Permissions are sometimes very useful as it gives us the benefit of hiding certain things from other users or make them non-editable for them.