topic Re: comparing floating point with borne shell in Operating System - Linux

comparing floating point with borne shell

Clarence Rebolledo — Wed, 25 Jul 2007 23:01:33 GMT

I have a script that awk the cpu percentage from a captured top screen.

pcent=`egrep "noc" |awk '{print $10}'1

Then I compare pcent with 90 because if the process is greater than 90 I want to kill the process.
hival=90
if [ $pcent -gt $hival ]
then
(here is where I kill the process)

I guess when pcent have a value of 88.11 it does not test correctly. Any way to convert 88.11 to a whole value instead of a decimal point value.

Re: comparing floating point with borne shell

Dennis Handly — Wed, 25 Jul 2007 23:18:39 GMT

>comparing floating point with borne shell

These are not the droids you want. :-)
There is no such thing as borne shell, only ksh and posix shell.

>Any way to convert 88.11 to a whole value instead of a decimal point value.

Just use awk's printf with integer format:
awk '{printf "%d\n", $10}'

Adding +.5 if you want to round up.

Re: comparing floating point with borne shell

Steven Schweda — Wed, 25 Jul 2007 23:21:38 GMT

echo '88.11' | sed -e 's/\.[0-9]*$//'

Re: comparing floating point with borne shell

Peter Nikitka — Thu, 26 Jul 2007 16:55:47 GMT

Hi,

since you already have awk in use, let the work be done here. This makes no sense, however:
>>
pcent=`egrep "noc" |awk '{print $10}'1
<<
So lets assume you get it anyway (substitute 'print 77.95' by your command):

high=90
print 77.95 | awk -v h=high '{if ($1 >h) exit 1;exit 0}'
if [ $? -gt 0 ]
then
print CPU-usage more then $high
fi

mfG Peter

Re: comparing floating point with borne shell

Clarence Rebolledo — Thu, 26 Jul 2007 17:07:31 GMT

Thanks, all the solutions that came in work.