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#! /usr/bin/perl
# this is for after install
use lib qw( /usr/lib/perl );
use RRDs;
my $start=time;
my $rrd="randome.rrd";
my $name = $0;
$name =~ s/.*\///g;
$name =~ s/\.pl.*//g;
RRDs::create ($rrd, "--start",$start-1, "--step",300,
"DS:a:GAUGE:600:U:U",
"DS:b:GAUGE:600:U:U",
"RRA:AVERAGE:0.5:1:300");
my $ERROR = RRDs::error;
die "$0: unable to create `$rrd': $ERROR\n" if $ERROR;
# dropt some data into the rrd
my $t;
for ($t=$start; $t<$start+300*300; $t+=300){
RRDs::update $rrd, "$t:".rand(100).":".(sin($t/800)*50+50);
if ($ERROR = RRDs::error) {
die "$0: unable to update `$rrd': $ERROR\n";
}
}
RRDs::graph "$name.png",
"--title", uc($name)." Demo",
"--start", "$start + 1 h",
"--end", "start + 1000 min",
"--interlaced",
"--imgformat","PNG",
"--width=450",
"DEF:a=$rrd:a:AVERAGE",
"DEF:b=$rrd:b:AVERAGE",
"CDEF:line=TIME,2400,%,300,LT,a,UNKN,IF",
"AREA:b#00b6e4:beta",
"AREA:line#0022e9:alpha",
"LINE3:line#ff0000",
;
if ($ERROR = RRDs::error) {
die "ERROR: $ERROR\n";
};
print "This script has created $name.png in the current directory\n";
print "This demonstrates the use of the TIME and % RPN operators\n";