feat: Add disk usage monitoring script

disk-usage-monitor/README.md

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+## Why?
+
+This is a handy script to monitor disk usage and send an email or Discord message if the usage exceeds a certain threshold (80% by default).
+
+## Parmeters
+
+The script accepts the following parameters:
+
+- `--email=<email address>`: The email address to send the message to. If not provided, the script will prompt the user to enter the email address.
+- `--discord=<webhook URL>`: The Discord webhook URL to send the message to. If not provided, the script will prompt the user to enter the webhook URL.
+- `--threshold=<percentage>`: The percentage threshold for disk usage. The default value is 80.
+
+## How to use?
+
+```bash
+bash -c "$(wget -qLO - https://raw.githubusercontent.com/bigbeartechworld/big-bear-scripts/master/disk-usage-monitor/run.sh)"
+```

disk-usage-monitor/run.sh

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+#!/bin/bash
+
+# Default values
+EMAIL=""
+DISCORD_WEBHOOK=""
+THRESHOLD=80
+
+# Parse arguments
+for ARG in "$@"
+do
+  case $ARG in
+    --email=*)
+      EMAIL="${ARG#*=}"
+      ;;
+    --discord=*)
+      DISCORD_WEBHOOK="${ARG#*=}"
+      ;;
+    --threshold=*)
+      THRESHOLD="${ARG#*=}"
+      ;;
+    *)
+      # Unknown option
+      ;;
+  esac
+done
+
+# Prompt for email if not set
+if [ -z "$EMAIL" ]; then
+  read -p "Please enter your email address (or press Enter to skip): " EMAIL
+fi
+
+# Prompt for Discord webhook if not set
+if [ -z "$DISCORD_WEBHOOK" ]; then
+  read -p "Please enter your Discord webhook URL (or press Enter to skip): " DISCORD_WEBHOOK
+fi
+
+# Get disk usage
+DISK_USAGE=$(df -h / | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 }')
+USAGE=$(echo $DISK_USAGE | sed 's/%//g')
+
+# Display current disk usage
+echo "Current disk usage is $DISK_USAGE."
+
+# Check if usage exceeds threshold
+if [ $USAGE -ge $THRESHOLD ]; then
+    MESSAGE="Disk usage is at $DISK_USAGE - Time to clean up!"
+
+    # Send email if an email address is provided
+    if [ -n "$EMAIL" ]; then
+        echo "$MESSAGE" | mail -s "Disk Usage Alert" "$EMAIL"
+    fi
+
+    # Send message to Discord webhook if a webhook URL is provided
+    if [ -n "$DISCORD_WEBHOOK" ]; then
+        curl -H "Content-Type: application/json" \
+            -X POST \
+            -d "{\"content\": \"$MESSAGE\"}" \
+            "$DISCORD_WEBHOOK"
+    fi
+else
+  MESSAGE="Disk usage is within acceptable limits."
+fi
+
+# Display the message
+echo "$MESSAGE"