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cutting 'used memory' from top command

rated 0 times [ 1] [ 0] / answers: 1 / hits: 838 / 3 Years ago, fri, may 7, 2021, 9:45:18

Using the top -b -n1 command I can get the resources utilised by my system for that instance. However, I actually need specific values out of it. I need things like, overall CPU usage, overall memory usage, and the top 5 processes using the cpu resources for that instance.
Currently I am able to find:

Cpu usage: top -b -d1 -n1|grep -i 'Cpu(s)'|head -c21|cut -d '' -f3|cut -d '%' -f1

Top 5 process : ps aux | sort -nrk 3,3 | head -n 5

I am unable to work out something for the Ram usage. I am trying commands something like in the Cpu usage command, but it returns me nothing. To be frank, I am unable to cut it out properly. Some help in retrieving that is appreciated.

Extra Help: Also, on the same grounds, is it possible to get the mac address of the system. Like a command that might just return me the mac address and not 100s of lines that I need to manipulate.

Thank you for the help.

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hentor

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1 Year ago

answered 3 Years ago itagde · Accepted Answer

Total RAM Usage:

This command will return your RAM total usage as GB:

free -h |grep Mem| cut -c 20-32 | sed -e 's/^[ 	]*//'

This will return your RAM total usage as Bytes (just remove the -h):

free |grep Mem| cut -c 20-32 | sed -e 's/^[ 	]*//'

This will report the percentage of memory in use

free | grep Mem | awk '{print $3/$2 * 100.0}'

This will report the percentage of memory that's free

free | grep Mem | awk '{print $4/$2 * 100.0}'

MAC Address:

If you want to output ONLY the mac address of a specific device, you can do this (replace "wlp2s0" with the name of your network interface):

nmcli -t -f GENERAL.HWADDR device show wlp2s0 | sed 's/GENERAL.HWADDR://'