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get CPU and Ram infos via bash


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I want to get cpu and ram infos via bash command.

So i use this for temperature:


For the cpu usage i needed a long time to find a solution. now i found this:

echo $[100-$(vmstat 1 2|tail -1|awk '{print $15}')]


For the free ram usage, i will use 

free --mega


My question

Are this command correct? the cpu command line is really new for me...


does it takes a lot of ressources, if i use this commands every 2 seconds to get a real time listening? i need to write it in a database to get a graphical solution.


Thank you for your help

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