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$me = "dirtest3";

...
$expl = "Full path in double quotes";
if ( -e "$full" )
{ print "'-e $expl' is true\n"; } else { print "'-e $expl' is false\n"
+; }

All of the following conditions are true on my system.
The issue is to see which tests work.
...
'-e Full path, unquoted' is true
'-e Full path in single quotes' is false
'-e Full path in double quotes' is true