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
HTH
Alex
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