watch
Rerun a command every 10 seconds:
watch -n 10 command
Monitor dirs with highlighting:
watch -d ls -l
Monitor disk usage for physical drives:
watch -n 10 'df -h | grep "^/dev"'
df=disk free, -h=human readable, ^ is regex for start of the line
Monitor top 10 node processes:
watch -n 5 'ps aux | grep node | head -10'