One important point to note here is that by default it sorts ascending. e shows every process on the system -o is to define the format we want the result in, as you can see we have specified the format as pid,cmd,%cpu,%mem, next -sort ofcourse, sorts.
ps ofcourse shows a snapshot of current processes. So, for bare bones, type ps -e -o pid,cmd,%cpu,%mem -sort=-%cpu | head -n 6 Want the overall usage.Here is something I came up with as I found the original answer a bit too arcane. This should be a good starting point, but myself and I think most readers only If you instead want the usage of each core, Omitting this space will give you a lot of percentages: two The space in the grep query 'cpu ' is intentional to grab only theĪggregate line. cpu0, cpu1, …) as well as the combination of all of them,Ĭpu. Note: The output of /proc/stat contains data for each core of your This solution is very fast, and gives a pretty accurate measurement of the current CPU usage. The next time you run this script # will calculate average usage since this line was run. usage = $( echo -e " $previous \n $current " | awk " $awkscript " ) # Save the current value. awkscript = 'NR = 1 ' # Execute the awk script against the two lines of input # and save the string. # For subsequent rows (NR > 1), calculate the difference # between this line and the first line and calculate the # total average percentage. # For the first line (NR = 1), save the values. previous = $(cat /tmp/cpustat ) current = $(grep 'cpu ' /proc/stat ) # Define the awk script to parse the two lines of input. # Load the previous state from the temp file, and capture # the current output. # This means the current reading will be pretty inaccurate, # usually too high, because it measures CPU usage from now # until 2 lines later in this program. } # If the temp file doesn't exist, save it now.
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