How to get overall CPU usage (e.g. 57%) on Linux

Question

How do I get the system CPU usage and give it in percent using bash, for example?

Sample output:

57%

In case there is more than 1 core, it would be nice if your average percentage could be calculated.

Answer 1

You can try:

top -bn1 | grep "Cpu(s)" | \

           sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | \

           awk '{print 100 - $1"%"}'

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