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  1. or download this
    my $enable_poe = `poe ds`; 
if ($enable_poe eq 'POE device missing or unpowered')
...
{
print "\nnothing happened\n";
}
  2. or download this
    user@device:/tmp$ poe ds

Device ID 2, Rev. 0
  3. or download this
    POE device missing or unpowered
  4. or download this
    Device ID 2, Rev. 0
  5. or download this
    Device ID 2, Rev. 0

Your Poe IS NOT enabled, dummy
  6. or download this
    if ($enable_poe == 'POE device missing or unpowered')