$ while true
> do
> grep 'cpu ' /proc/stat | awk '{usage=($2+$4)*100/($2+$4+$5)} END {print usage "%"}'
> sleep 1
> done
9.04976%
9.05032%
9.05019%
9.05012%
9.04998%
9.04982%
9.04962%
9.04945%
9.04945%
9.04941%
9.04959%
9.0505%
9.05128%
9.05112%
9.05101%
9.05085%
9.0508%
9.05062%
9.05059%
9.05054%
9.0504%
9.05095%
9.05099%
9.05086%
9.05076%
9.0506%
9.05044%
9.05031%
9.0503%
9.05028%
9.05014%
9.04998%
9.05068%
9.05054%
9.05052%
9.05036%
9.0502%
9.04999%
9.04999%
9.04999%
9.0499%
9.04972%
9.0503%
9.05019%
9.05009%
9.04994%
9.04982%
9.04964%
9.04961%
9.04961%
9.04947%
9.04936%
9.04972%
9.04984%
9.04977%
9.0496%
9.04942%
9.04933%
9.04929%
9.04922%
9.04908%
9.0489%
9.04874%
9.04949%
9.0494%
9.04923%
9.04908%
9.04889%
9.04889%
9.04891%
9.0488%
9.04862%
9.04846%
9.04909%
9.04904%
9.04896%
9.04881%
9.04863%
9.04861%
9.04854%
9.04838%
9.04826%
9.0481%
9.04831%
9.04867%
9.04855%
9.04841%
9.04828%
9.04828%
9.04821%
9.04805%
9.04793%
9.04775%
9.04764%
9.04836%
9.04824%
9.04806%
9.0479%
9.04785%
9.04792%
9.04783%
9.04764%
9.04748%
9.04737%
9.04807%
9.04803%
9.04787%
9.04773%
9.04775%
9.04766%
9.04752%
9.04743%
9.04725%
9.04707%
9.04715%
9.04765%
9.04753%
9.04742%
9.0474%
9.04732%
9.04721%
9.04701%
9.04687%
9.04673%
9.04661%
9.04725%
9.04718%
9.04702%
9.04699%
9.04709%
9.04723%
9.04737%
9.04752%
9.04848%
9.04962%
9.05026%
9.05041%
9.05049%
9.0504%
9.05027%
9.05008%
9.04997%