# Shell Scripting and Automation

## Overview
This document tracks the implementation of shell scripts and automation tasks for our Ubuntu Server VM.

## Shell Scripting Basics

### 1. First Script: System Health Check ✅
```bash
#!/bin/bash
# system-health.sh - Basic system health check script

# Create script
sudo nano /usr/local/bin/system-health.sh
```

Script contents:
```bash
#!/bin/bash

# System Health Check Script
echo "=== System Health Check ==="
echo "Date: $(date)"
echo

# System uptime
echo "=== System Uptime ==="
uptime
echo

# Memory usage
echo "=== Memory Usage ==="
free -h
echo

# Disk usage
echo "=== Disk Usage ==="
df -h /
echo

# CPU load
echo "=== CPU Load ==="
mpstat 1 1
echo

# Active system services
echo "=== System Services ==="
systemctl list-units --type=service --state=running
echo

# Recent system logs
echo "=== Recent System Logs ==="
tail -n 5 /var/log/syslog
```

### Script Setup ✅
```bash
# Install required package
sudo apt install sysstat

# Make script executable
sudo chmod +x /usr/local/bin/system-health.sh

# Test script
sudo /usr/local/bin/system-health.sh
```

### Test Results ✅
- Script executed successfully
- All system metrics collected:
  - System uptime (4 users, load average visible)
  - Memory usage (1.9GB total, 370MB used)
  - Disk usage (75% used)
  - CPU load (97.11% idle)
  - Active services (15 services running)
  - Recent system logs

### Next Improvements
1. Add Error Handling
```bash
#!/bin/bash

# Add error handling
set -e  # Exit on error
exec 2> >(tee -a /var/log/system-health.error.log)  # Log errors

# Function for error handling
check_command() {
    if ! command -v $1 &> /dev/null; then
        echo "Error: $1 is not installed" >&2
        exit 1
    fi
}

# Check required commands
check_command free
check_command df
check_command mpstat
check_command systemctl
```

2. Add Logging
```bash
# Add timestamp and logging
LOG_FILE="/var/log/system-health.log"
exec 1> >(tee -a $LOG_FILE)  # Log stdout
```

Would you like to:
1. Implement these improvements
2. Schedule regular execution
3. Add more system checks

### Automation Plan
1. System Health Monitoring
   - [ ] Create basic health check script
   - [ ] Add error checking
   - [ ] Implement logging
   - [ ] Schedule regular execution

2. Maintenance Tasks
   - [ ] Create cleanup script
   - [ ] Automate log analysis
   - [ ] Monitor service status

3. Reporting
   - [ ] Generate system reports
   - [ ] Email notifications
   - [ ] Performance tracking

## Implementation Status
- [x] Basic Script Creation
- [ ] Error Handling
- [ ] Logging Implementation
- [ ] Automated Scheduling