This snippet reads several system variables pushes them onto an array. If the array contains more than one value, the two are compared. If there is more than a 10% difference between the two, a page is sent to a relevant individual. It runs every three hours. This works well for a lot of engineering applications.
#!/usr/local/bin/perl -w
use diagnostics;

my $test_st = qx(read_apt _test_status);
chomp $test_st;
print "$test_st\n";
#my $test_st = "Test running";
while ($test_st eq "Test running")
{
print "started\n";
my $lube1_mean = qx(read_apt LUBE1_STAT.statave);
push @lube1_means, $lube1_mean;

my $lube2_mean = qx(read_apt LUBE2_STAT.statave);
push @lube2_means, $lube2_mean;

my $lube3_mean = qx(read_apt LUBE3_STAT.statave);
push @lube3_means, $lube3_mean;

my $lube4_mean = qx(read_apt LUBE4_STAT.statave);
push @lube4_means, $lube4_mean;

my $speed1_mean = qx(read_apt SPEED1_STAT.statave);
push @speed1_means, $speed1_mean;

my $speed2_mean = qx(read_apt SPEED2_STAT.statave);
push @speed2_means, $speed2_mean;

my $speed3_mean = qx(read_apt SPEED3_STAT.statave);
push @speed3_means, $speed3_mean;

my $speed4_mean = qx(read_apt SPEED4_STAT.statave);
push @speed4_means, $speed4_mean;
my $a = @lube1_means;

if ($a > 1)
{
compare($lube1_means[$a - 2], $lube1_means[$a-1]);
compare($lube2_means[$a - 2], $lube2_means[$a-1]);
compare($lube3_means[$a - 2], $lube3_means[$a-1]);
compare($lube4_means[$a - 2], $lube4_means[$a-1]);
compare($speed1_means[$a - 2], $speed1_means[$a-1]);
compare($speed2_means[$a - 2], $speed2_means[$a-1]);
compare($speed3_means[$a - 2], $speed3_means[$a-1]);
compare($speed4_means[$a - 2], $speed4_means[$a-1]);

}
sleep 10800;
}

sub compare
{
my $a = abs($_[0]);
my $b = abs($_[1]);
if (($b > (1.1 * $a)) || ($b < (.9 * $a)))
{
system "msgto2 arcove - values are out of spec";

}
}

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In reply to data comparison by Lhamo_rin

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