Cron Scheduling Development Tutorials, Guides & Insights

0 * * * * df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output; do
  usep=$(echo $output | awk '{ print $1}' | sed 's/%//g')
  partition=$(echo $output | awk '{ print $2 }')
  if [ $usep -ge 80 ]; then
    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |
    mail -s "Alert: Almost out of disk space $usep%" user@example.com
  fi
done

Instead of directly writing commands in the crontab, you can schedule scripts to run at specific intervals. This approach is particularly useful for complex tasks.