[rrd-users] Re: how to draw a (high-water mark) line across a graph ??

Alex van den Bogaerdt alex at ergens.op.het.net
Tue Feb 24 10:13:18 MET 2004

On Mon, Feb 23, 2004 at 10:55:15PM -0800, Eric Ho wrote:

> How can I draw a high-water mark line across a graph ?

1: find out the high-water mark
2: draw the line.

For #1:  use rrdtool without graphing elements, use PRINT in stead
(that's PRINT, not GPRINT !!!) with, in this case, MAX.

For #2:  use HLINE in your grapher script, with a variable in the
calling script (NOT in the rrdtool command input).

For instance in bash:

highwater=`rrdtool graph ... PRINT:ds0:MAX:%6.2lf`
echo DEBUG: highwater=${highwater}
rrdtool graph ... HLINE:${highwater}#F00

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