[rrd-users] CDEF: comparing Strings

Steve Shipway s.shipway at auckland.ac.nz
Mon Nov 7 22:05:55 CET 2011

The RPN calculations work only with numbers.  Since the RRD can only hold
numbers anyway, there is no need for it to handle strings.





Steve Shipway

ITS Unix Services Design Lead

University of Auckland, New Zealand

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Email:  <mailto:s.shipway at auckland.ac.nz> s.shipway at auckland.ac.nz

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From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch
[mailto:rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] On
Behalf Of Andre Luis
Sent: Tuesday, 8 November 2011 12:45 a.m.
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] CDEF: comparing Strings


hello, I'm new into cacti and I would like to know it there's a way to
compare strings with CDEF ...

I did some tests using numbers and it worked, but when I try with strings,
it gives an error.."ERROR: invalid rpn expression in:"

for example..
assuming a=10;
a,10,EQ,1,0,IF ..
it works...returns 1 ...

but with strings:
assuming a="test"
a,test,EQ,1,0,IF ..
it gives me the error message above...

I guess I should use another boolean function .. different than EQ .. but I
don't know how..
is there any way?





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