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This command will show the 20 processes using the most CPU time (hungriest at the bottom).
You can see the 20 most memory intensive processes (hungriest at the bottom) by running:
ps aux | sort +3n | tail -20
Or, run both:
echo "CPU:" && ps aux | sort +2n | tail -20 && echo "Memory:" && ps aux | sort +3n | tail -20
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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