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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/chaterm/terminal-skills --skill user-permissions- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads user-permissions automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
User and Permission Management
Overview
Linux user management, group management, sudo configuration, ACL permissions and other skills.
User Management
View Users
# Current user
whoami
id
# User information
id username
finger username
# All users
cat /etc/passwd
getent passwd
# Logged in users
who
w
last # Login history
User Operations
# Create user
useradd username
useradd -m -s /bin/bash username # Create home directory, specify shell
useradd -G group1,group2 username # Specify supplementary groups
# Modify user
usermod -aG groupname username # Add to group
usermod -s /bin/zsh username # Change shell
usermod -L username # Lock user
usermod -U username # Unlock user
# Delete user
userdel username
userdel -r username # Also delete home directory
# Change password
passwd username
passwd -l username # Lock password
passwd -u username # Unlock password
chage -l username # View password policy
Group Management
View Groups
# User's groups
groups username
id -Gn username
# All groups
cat /etc/group
getent group
# Group members
getent group groupname
Group Operations
# Create group
groupadd groupname
groupadd -g 1001 groupname # Specify GID
# Modify group
groupmod -n newname oldname # Rename
# Delete group
groupdel groupname
# Manage group members
gpasswd -a username groupname # Add user
gpasswd -d username groupname # Remove user
gpasswd -M user1,user2 groupname # Set member list
sudo Configuration
Basic Usage
# Execute as root
sudo command
sudo -i # Switch to root shell
sudo -u username command # Execute as another user
# View permissions
sudo -l
sudoers Configuration
# Edit sudoers (recommended method)
visudo
# Or edit files under /etc/sudoers.d/
visudo -f /etc/sudoers.d/username
Common Configuration Examples
# /etc/sudoers.d/username
# Full privileges
username ALL=(ALL:ALL) ALL
# No password required
username ALL=(ALL) NOPASSWD: ALL
# Specific commands
username ALL=(ALL) /usr/bin/systemctl restart nginx
# Specific commands without password
username ALL=(ALL) NOPASSWD: /usr/bin/docker
# Group privileges
%groupname ALL=(ALL) ALL
ACL Permissions
View ACL
getfacl file
getfacl -R dir # Recursive view
Set ACL
# Set user permissions
setfacl -m u:username:rwx file
setfacl -m u:username:rx dir
# Set group permissions
setfacl -m g:groupname:rx file
# Set default ACL (new files inherit)
setfacl -d -m u:username:rwx dir
# Recursive set
setfacl -R -m u:username:rx dir
# Remove ACL
setfacl -x u:username file # Remove specific
setfacl -b file # Remove all
Special Permissions
SUID/SGID/Sticky
# SUID (4) - Execute as file owner
chmod u+s file
chmod 4755 file
# SGID (2) - Execute as file group/directory inherits group
chmod g+s file
chmod 2755 dir
# Sticky (1) - Only owner can delete
chmod +t dir
chmod 1777 dir
# View
ls -la
# -rwsr-xr-x SUID
# -rwxr-sr-x SGID
# drwxrwxrwt Sticky
Common Scenarios
Scenario 1: Create Developer User
# Create user and group
groupadd developers
useradd -m -s /bin/bash -G developers devuser
# Set password
passwd devuser
# Configure sudo
echo "devuser ALL=(ALL) NOPASSWD: /usr/bin/docker, /usr/bin/systemctl" > /etc/sudoers.d/devuser
chmod 440 /etc/sudoers.d/devuser
Scenario 2: Shared Directory Permissions
# Create shared directory
mkdir /shared
groupadd shared
chown root:shared /shared
chmod 2775 /shared # SGID ensures new files inherit group
# Add users to group
usermod -aG shared user1
usermod -aG shared user2
Scenario 3: Restrict User to Specific Commands
# /etc/sudoers.d/limited-user
limited ALL=(ALL) NOPASSWD: /usr/bin/systemctl status *, /usr/bin/journalctl
Troubleshooting
| Problem | Solution |
|---|---|
| sudo permission denied | Check /etc/sudoers.d/ configuration |
| User cannot login | Check shell, password lock status |
| Group permissions not working | Re-login or newgrp groupname |
| ACL not working | Check if filesystem supports ACL |
FAQ
What does the user-permissions skill do?
Linux user and permission management
How do I install user-permissions?
Run npx skills add https://github.com/chaterm/terminal-skills --skill user-permissions in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/user-permissions/ (personal) or .claude/skills/user-permissions/ (project).
Which AI agents can use user-permissions?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is user-permissions safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains user-permissions?
It is published by chaterm in chaterm/terminal-skills. It has 66 recorded installs.
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