[rrd-users] An example of the use of --template in rrdupdate please ?

Stanley Hopcroft Stanley.Hopcroft at IPAustralia.Gov.AU
Thu Aug 28 06:29:06 MEST 2003

Dear Ladies and Gentlemen,

Would some kind soul please post an example of the use of the --template
option to the rrdupdate command ?

I had thought that with an RRD containing DSs named (a, b, c, d) in that 
sequence that

rrdupdate .. --template=d:c:b:a N:D:C:B:A 

would update 

DS d with value D
DS c with value C
DS b with value B and
DS a with value A

however, it seems that what is happening is that the DSs are updated 
in the same order as the position of the update value in the update 
string (ie an update string of N:u1:u2:u3 updates DS 1 [a in this 
example] with u1, DS 2 [b] with u2 and so on).

So with the rrdupdate above, the DSs are updated like

DS a with value D
DS b with value C
DS c with value B and 
DS a with value A

What should I expect to see ?

After reading the FM, I thought the former interpretation correct (ie 
that the template specifies the order of the update) but practise leads 
me to think the latter.

(RRDtool 1.0.41  Copyright 1997-2000 by Tobias Oetiker 
<tobi at oetiker.ch>, from the FreeBSD packages).

I will check my code but I would appreciate any comments.

Thank you,

Yours sincerely.

Stanley Hopcroft

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.

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