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Midori's Linux Dojo 🌸/Phase 3 - Users and Files/Exercises.md

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+# 🧰 Phase 3: Users and Files
+
+> Goal: Who can do what — users, groups, permissions, processes
+
+---
+
+## 🎯 Exercise 1 — User Management
+
+```bash
+# Create users
+useradd -m bob
+passwd bob              # Set a password
+
+# Check user info
+id bob
+cat /etc/passwd | grep bob
+
+# Groups
+groupadd developers
+usermod -aG developers bob
+groups bob
+
+# Switch user
+su - bob
+whoami
+exit
+```
+
+---
+
+## 🎯 Exercise 2 — File Ownership
+
+```bash
+# Create file as root, give to bob
+touch /root/lab/team-project.txt
+chown bob:developers /root/lab/team-project.txt
+ls -la /root/lab/team-project.txt
+
+# Set permissions
+chmod 640 /root/lab/team-project.txt
+```
+
+---
+
+## 🎯 Exercise 3 — Sudo / Doas
+
+```bash
+# Give bob sudo access
+echo "bob ALL=(ALL) ALL" >> /etc/sudoers
+# OR on Alpine (doas):
+echo "permit persist bob" >> /etc/doas.d/doas.conf
+```
+
+---
+
+## 🎯 Exercise 4 — Processes
+
+```bash
+# View processes
+ps aux
+ps -ef
+top                     # Press 'q' to quit
+
+# Background jobs
+sleep 100 &
+jobs
+kill %1
+
+# Service management (Alpine)
+rc-service sshd status
+rc-update show
+```
+
+---
+
+## ✅ Phase 3 Checklist
+- [ ] Create users and groups
+- [ ] File ownership and permissions
+- [ ] Sudo/doas configuration
+- [ ] Process management
+
+**Previous:** [[Phase 2 - Networking]] | **Next:** [[Phase 4 - Security]]