numbers when using rrdtool 1.2.x. A safe bet it to use lowercase or mixed case names for variables since operators will always be in uppercase. By default, rrdtool wil produce PNG files, with a 1-day history. 1 rrdtool graph takes an existing.rrd and should create (using your command) a colorful png image. Apart from generating graphs, data can also be extracted to stdout. the display of the "last updated time" on the detailed screen. Make sure to tell the viewer of your graph you did this ... As with the other graphing elements, you can specify a number or a variable here. rrd_datadir=/var/lib/cmon/. However, (usually available from. No changes were required when upgrading from 1.0.x to 1.2.x. If the filename is set to '-' the image file will be written to standard out. Replace this with the update script of your choice to fill the database with the data you need. PNG output is recommended, since it takes up to 40% less disk space and 20-30% less time to generate than a GIF file. filename. rrdtool graph command reference rrdgraph_libdbi fetching data for graphing in rrdtool graph via libdbi rrdgraph_rpn About RPN Math in rrdtool graph rrdinfo extract header information from an RRD rrdlast Return the date of the last data sample in an RRD rrdlastupdate Return the most recent update to an RRD rrdlist List directories and rrd databases. rrdgraph_data - preparing data for graphing in rrdtool graph SYNOPSIS DEF:=:: ... end=