Skill: ckchzh/systemd (version 1.0.0)

--- name: "systemd" version: "1.0.0" description: "Systemd reference tool. Use when working with systemd in sysops contexts." author: "BytesAgain" homepage: "https://bytesagain.com" source: "https://github.com/bytesagain/ai-skills" tags: [systemd, sysops, dev, reference, cli] category: "sysops" --- # Systemd Systemd reference tool. Use when working with systemd in sysops contexts. ## When to Use - Working with systemd and need quick reference - Looking up sysops standards or best practices for systemd - Troubleshooting systemd issues - Need a checklist or guide for systemd tasks ## Commands ### `intro` ```bash scripts/script.sh intro ``` Overview and core concepts ### `quickstart` ```bash scripts/script.sh quickstart ``` Getting started guide ### `patterns` ```bash scripts/script.sh patterns ``` Common patterns and best practices ### `debugging` ```bash scripts/script.sh debugging ``` Debugging and troubleshooting ### `performance` ```bash scripts/script.sh performance ``` Performance optimization tips ### `security` ```bash scripts/script.sh security ``` Security considerations ### `migration` ```bash scripts/script.sh migration ``` Migration and upgrade guide ### `cheatsheet` ```bash scripts/script.sh cheatsheet ``` Quick reference cheat sheet ### `help` ```bash scripts/script.sh help ``` ### `version` ```bash scripts/script.sh version ``` --- *Powered by BytesAgain | bytesagain.com | [REDACTED_SECRET]*

path: scripts/script.sh
content: #!/usr/bin/env bash
# systemd — Systemd reference tool. Use when working with systemd in sysops contexts.
# Powered by BytesAgain | bytesagain.com | [REDACTED_SECRET]
set -euo pipefail

VERSION="1.0.0"

show_help() {
    cat << 'HELPEOF'
systemd v$VERSION — Systemd Reference Tool

Usage: systemd <command>

Commands:
  intro           Overview and core concepts
  quickstart      Getting started guide
  patterns        Common patterns and best practices
  debugging       Debugging and troubleshooting
  performance     Performance optimization tips
  security        Security considerations
  migration       Migration and upgrade guide
  cheatsheet      Quick reference cheat sheet
  help              Show this help
  version           Show version

Powered by BytesAgain | bytesagain.com
HELPEOF
}

cmd_intro() {
    cat << 'EOF'
# Systemd — Overview

## What is Systemd?
Systemd (systemd) is a specialized tool/concept in the sysops domain.
It provides essential capabilities for professionals working with systemd.

## Key Concepts
- Core systemd principles and fundamentals
- How systemd fits into the broader sysops ecosystem  
- Essential terminology every practitioner should know

## Why Systemd Matters
Understanding systemd is critical for:
- Improving efficiency in sysops workflows
- Reducing errors and downtime
- Meeting industry standards and compliance requirements
- Enabling better decision-making with accurate data

## Getting Started
1. Understand the basic systemd concepts
2. Learn the standard tools and interfaces
3. Practice with common scenarios
4. Review safety and compliance requirements
EOF
}

cmd_quickstart() {
    cat << 'EOF'
# Systemd — Quick Start Guide

## Prerequisites
- Basic understanding of sysops concepts
- Required tools and access credentials
- System meeting minimum requirements

## Installation
1. Download or clone the systemd package
2. Install dependencies
3. Configure initial settings
4. Verify installation

## First Steps
1. Run the hello-world example
2. Review the default configuration
3. Try a simple real-world task
4. Explore available commands and options

## Next Steps
- Read the full documentation
- Join the community forum
- Try advanced features
- Set up automated workflows
EOF
}

cmd_patterns() {
    cat << 'EOF'
# Systemd — Common Patterns & Best Practices

## Design Patterns
1. **Standard Pattern**: The most common approach for systemd
2. **Scalable Pattern**: For high-volume or distributed scenarios
3. **Resilient Pattern**: For fault-tolerant implementations

## Best Practices
- Follow the principle of least privilege
- Use version control for all configurations
- Implement comprehensive logging
- Test changes in staging before production
- Document all custom configurations

## Anti-Patterns to Avoid
- Hardcoding credentials or configuration
- Skipping validation and error handling
- Ignoring monitoring and alerting
- Making changes without documentation
- Over-engineering simple solutions
EOF
}

cmd_debugging() {
    cat << 'EOF'
# Systemd — Debugging Guide

## Common Errors
1. **Connection refused**: Check service status and network
2. **Permission denied**: Verify credentials and access rights
3. **Timeout**: Check network, increase limits, optimize queries
4. **Invalid input**: Validate data format and encoding

## Debugging Tools
- Built-in logging and diagnostics
- Network analysis tools (tcpdump, wireshark)
- System monitoring (top, htop, iostat)
- Application-specific debug modes

## Debug Workflow
1. Reproduce the issue consistently
2. Check logs for error messages
3. Isolate the failing component
4. Test with minimal configuration
5. Apply fix and verify
EOF
}

cmd_performance() {
    cat << 'EOF'
# Systemd — Performance Optimization

## Key Metrics
- Response time / latency
- Throughput / operations per second
- Resource utilization (CPU, memory, I/O)
- Error rate and retry frequency

## Optimization Strategies
1. **Caching**: Reduce redundant operations
2. **Batching**: Group small operations
3. **Indexing**: Speed up data lookups
4. **Compression**: Reduce data transfer size
5. **Parallel Processing**: Utilize multiple cores

## Monitoring
- Set up baseline performance metrics
- Configure alerts for anomalies
- Track trends over time
- Regular capacity planning reviews
EOF
}

cmd_security() {
    cat << 'EOF'
# Systemd — Security Considerations

## Authentication & Authorization
- Use strong, unique credentials
- Implement role-based access control
- Enable multi-factor authentication where possible
- Regularly review and rotate credentials

## Data Protection
- Encrypt data at rest and in transit
- Implement proper backup procedures
- Follow data retention policies
- Sanitize inputs to prevent injection

## Network Security
- Use firewalls and network segmentation
- Monitor for suspicious activity
- Keep all software patched and updated
- Disable unnecessary services and ports
EOF
}

cmd_migration() {
    cat << 'EOF'
# Systemd — Migration & Upgrade Guide

## Pre-Migration Checklist
- [ ] Current system fully documented
- [ ] Complete backup taken and verified
- [ ] Target environment prepared
- [ ] Rollback plan documented
- [ ] Stakeholders notified

## Migration Steps
1. Prepare target environment
2. Export data from source
3. Transform data if needed
4. Import to target
5. Verify data integrity
6. Update configurations
7. Test all functionality
8. Switch traffic / go live

## Post-Migration
- Monitor for errors and performance
- Verify all integrations working
- Update documentation
- Decommission old system after confirmation
EOF
}

cmd_cheatsheet() {
    cat << 'EOF'
# Systemd — Quick Reference

## Essential Commands
| Command | Description |
|---------|-------------|
| help | Show available commands |
| version | Display version info |
| intro | Overview and fundamentals |
| troubleshooting | Common problems and fixes |

## Common Workflows
1. **Setup**: install → configure → verify → test
2. **Daily**: check → monitor → report → review
3. **Issue**: diagnose → isolate → fix → verify → document

## Key Shortcuts
- Use tab completion for commands
- Check logs first when troubleshooting
- Always backup before making changes
- Document everything you change
EOF
}

CMD="${1:-help}"
shift 2>/dev/null || true

case "$CMD" in
    intro) cmd_intro "$@" ;;
    quickstart) cmd_quickstart "$@" ;;
    patterns) cmd_patterns "$@" ;;
    debugging) cmd_debugging "$@" ;;
    performance) cmd_performance "$@" ;;
    security) cmd_security "$@" ;;
    migration) cmd_migration "$@" ;;
    cheatsheet) cmd_cheatsheet "$@" ;;
    help|--help|-h) show_help ;;
    version|--version|-v) echo "systemd v$VERSION — Powered by BytesAgain" ;;
    *) echo "Unknown: $CMD"; echo "Run: systemd help"; exit 1 ;;
esac


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