A shell script to automate system monitoring, maintenance and email you the results

maintenance.sh

#!/bin/bash

# System Maintenance Script

# Create log file
log=/var/log/maintenance.log

# Print start status 
echo "$(date) - Starting system maintenance" >> $log

# Update package lists
apt update >> $log 2>&1

# Upgrade packages
apt upgrade -y >> $log 2>&1

# Clear package cache
apt autoremove --purge -y >> $log 2>&1

# Check disk usage
diskusage=( $(df -h | grep -v "Filesystem" | awk '{print $5}') )
echo "$(date) - Disk usage:" >> $log
printf '%s\n' "${diskusage[@]}" >> $log

# List open files
openfiles=( $(lsof | wc -l) ) 
echo "$(date) - Open files: $openfiles" >> $log

# Email log file
mail -s "System Maintenance Log" admin@example.com < $log

echo "$(date) - Maintenance complete" >> $log