---
title: 3. Users & Permissions
collection: linux
author: Akash Kadlag
updated: 2026-10-20
source: https://docs.chaicode.com/linux/users-permissions
---

# 3. Users & Permissions

![Welcome](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/be9ac860243e6d670c12889dafcc0843b0814392471ac489fe447eab960ff666.png)

Welcome

![Everything has owner](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/c4ed1be6db966ac1498a5f085d64007f70afdf3c3caa312bb3917ed5b674e2e6.jpg)

Everything has owner

![Account](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/2c35b601302c5a6441d6c6b201e140de7a39438a31a5b7fe49eb26c54c44f9c1.jpg)

Account

![Groups](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/ee5271b7118deb3fb465adfb4b7750b2d07d39db3967e4ded6f5e42a6155012d.jpg)

Groups

![User Details](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/7e8a0a31be6179907ab212f850bb09585b2e01672505a7291db1d8b18927a034.jpg)

User Details

![Types of Account](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/b47b20e44f195bc01f3f2e3b8aa43d1600ee6ac7758cbd77a303b8f23c0eb256.jpg)

Types of Account

![sudo](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/50583b4f5ae178db68bd9cf7aa6172190a49e2bcb6bef6227d3f11a3ca503841.jpg)

sudo

![Why sudo](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/8d0dd38874d943ec3b08653cf490fa47266bba1543149d7f40a012e2f6ec8cf7.jpg)

Why sudo

![Practise Round - 1](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/105d728e16e6289efcd1fe7aa2df2fdd9448de469b15d5881a78efa0bb553ac6.jpg)

Practise Round - 1

![long listing](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/e3eff023c7763ef4b12f27c0faaf61f27324303c7bf21ee4361b811d28b430b6.jpg)

long listing

![Permission Types](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/5563bd2de7ab5ee78488c9b5e90a3eed56f514f154c90ae60a158cd8a4260aa0.jpg)

Permission Types

![Owner, Group & Others](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/d1b0b8d355e3745a1eaf4685823f0868475a291b0f5bca5dae94b56642769471.jpg)

Owner, Group & Others

![Change File Permissions](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/a54cee2f232468ad26693df870dfe8509dca8b0c4a1a19a5441b93ff4949cbc1.jpg)

Change File Permissions

![Change Ownership](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/d6869565edb126988d8d6ac61d3ebf603d88bcb9fc04947d1e53fef4786751da.jpg)

Change Ownership

![Practice Round - 2](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/105d728e16e6289efcd1fe7aa2df2fdd9448de469b15d5881a78efa0bb553ac6.jpg)

Practice Round - 2

![Common Mistakes](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/313573e126130a63e4d17c20846cc9e189da42d3bcf124b24b8187226993a27f.jpg)

Common Mistakes

![chmod 777](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/a23ab63e985cb82bf5e62b2e7fdc81ea88f9a01ae90f689e99684d5a759a87ca.png)

chmod 777

![Keeping gate wide open](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/948e8ede6b8183cb31f9aecde4f355a988ee89a3eae1c45c90e2f9ace7178702.png)

Keeping gate wide open

![Challenges](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/bf958f8f440cde4f770699a9191df296591125670391de1532a4ccea27cab8fb.jpg)

Challenges

![Challenge - 1](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/9e516def5daec93028af9eb99e86ba836be7ed99301e98c1f8896758d6cc2c85.png)

Challenge - 1

![Challenge - 2](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/4fdd1b299d60e3d61360575abd3bb96f98a76992bce1a2dd9458ffda4c9eb391.png)

Challenge - 2

![Challenge - 3](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/a87ddf50421d862a8891edf3e0bbef88c7f6f788d077dbd161d503877c537bf8.png)

Challenge - 3

![Challenge - 4](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/ed954563b479dc08dbc1bc99f0e03bc395488f17bd005f11be332584cc08d61e.png)

Challenge - 4

![Bonus](https://docs.chaicode.com/cdn-cgi/image/width=1600,format=auto,fit=scale-down/assets/c5d85f0c846de2fe34910f852b76441befe81c396eec6ee4b1446842917413fb.jpg)

Bonus