Cant get my head around this works:
if($> && $> eq 0)
if ($>)
but this doesnt:
if($> eq 0) # sudo
if($> == 0)
{
#    exec { "/path-to-wrapper-program" }
#       ( "/path-to-wrapper-program",$0,@ARGV);
  exec { "$0" }                                 #<<<<<<<<<<<error if l
+ast 2
       ( "$0",$0,@ARGV);
}

[download]

Seems like in above 2 $> is popped off a stack with null left.

In reply to Syntax using user define $> by bigal_george

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