How to sum values from top

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# 8  
Old 10-13-2009
c1=$(top -b -n 1| grep Cpu | cut -c 35-39)
echo $c1

c2=$(top -b -n 1| grep Cpu | cut -c 9-12)
echo $c2

c3=$(top -b -n 1| grep Cpu | cut -c 19-21)
echo $c3

So Smilie I need to sum c1+c2+c3 = c (need to get CPU total usage ), that variable c i want to use in different if statements (if test $c -lt 10; then). When i try to use c=$(($c1+$c2)) it gives me error (if i use just c=$(($11+$11)) it works). It means, that c1 and c2 are not integer values? So how can i fix it?
# 9  
Old 10-14-2009
typeset -i c1 c2 c3

... makes no sense to me. $ is beginning character of a variable. There are positional variables/parameters but you are not using $11 from your examples so I guess it is a typo.
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