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infrastructure/servers/user-management/SKILL.md

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+---
+name: user-management
+description: Manage users, groups, and permissions on Linux systems. Configure sudo and access controls. Use when managing system access.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# User Management
+
+Manage users, groups, and permissions.
+
+## User Operations
+
+```bash
+# Create user
+useradd -m -s /bin/bash username
+passwd username
+
+# Delete user
+userdel -r username
+
+# Modify user
+usermod -aG sudo username
+usermod -s /bin/zsh username
+```
+
+## Group Management
+
+```bash
+# Create group
+groupadd developers
+
+# Add user to group
+usermod -aG developers username
+gpasswd -a username developers
+
+# Remove from group
+gpasswd -d username developers
+```
+
+## Sudo Configuration
+
+```bash
+# /etc/sudoers.d/developers
+%developers ALL=(ALL) NOPASSWD: /usr/bin/docker
+username ALL=(ALL) NOPASSWD: ALL
+```
+
+## File Permissions
+
+```bash
+chmod 755 file        # rwxr-xr-x
+chmod u+x file        # Add execute for user
+chown user:group file # Change ownership
+chown -R user:group dir/
+
+# ACLs
+setfacl -m u:user:rx file
+getfacl file
+```
+
+## Best Practices
+
+- Use groups for access control
+- Minimal sudo privileges
+- Regular access reviews
+- Strong password policies