Master the Linux Filesystem & User Permissions in 10 Minutes
Stop struggling with the Linux Terminal. In this video, we break down the entire Linux Directory Hierarchy (Standard) and show you exactly how to manage users and groups like a Senior System Admin. Whether you're preparing for an AWS/Azure certification or just starting with Ubuntu, this is your roadmap.
What we cover:
0:00 - The Root (/) Explained
2:15 - /bin vs /sbin: What's the difference?
4:30 - User Management (useradd, passwd)
7:45 - Managing Groups for Security
10:00 - Pro Navigation Shortcuts
1. Navigating the Linux System
Navigation is all about knowing where you are and how to get where you're going.
pwd (Print Working Directory): Your "GPS"—it tells you exactly where you are.
ls (List): See what’s inside. Use ls -la to see hidden files and detailed permissions.
cd (Change Directory):
cd /etc (Go to a specific path)
cd .. (Go up one level)
cd ~ (Go back to your home directory)
mkdir / rmdir: Create or remove folders.
2. Managing Users & Groups
In Linux, security is based on who you are (User) and what role you play (Group).
User Management
useradd: Create a new user.
Example: sudo useradd -m sagar (The -m creates the home directory).
passwd: Set or change a password.
Example: sudo passwd sagar
userdel: Remove a user.
Example: sudo userdel -r sagar (The -r deletes their files too).
whoami: Confirms which user you are currently logged in as.
Group Management
Groups allow you to give the same permissions to multiple users at once (e.g., all "developers" can edit /var/www).
groupadd: Create a new group.
Example: sudo groupadd devops
usermod: Add a user to a group.
Example: sudo usermod -aG devops sagar (The -aG appends the user to the group without removing them from others).
groups: Check which groups a user belongs to.
. @codenyra