my $enable_poe = `poe ds`; 
if ($enable_poe eq 'POE device missing or unpowered')
{
print $enable_poe, "\n", "Your Poe IS NOT enabled, dummy\n";
}
elsif($enable_poe eq 'Device ID 2, Rev. 0')
{
print $enable_poe, "\n", "Your PoE IS enabled, dummy\n";
}
else
{
print "\nnothing happened\n";
}

##</code><code>##

user@device:/tmp$ poe ds

Device ID 2, Rev. 0

##</code><code>##

POE device missing or unpowered

##</code><code>##

Device ID 2, Rev. 0

##</code><code>##

Device ID 2, Rev. 0

Your Poe IS NOT enabled, dummy

##</code><code>##

if ($enable_poe == 'POE device missing or unpowered')