I'm not sure what the problem is; the code

foreach $key(sort keys(%ENV)) {
   print "$key = $ENV{$key}<p>";}
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should give you all the information available. Why do you need to print it out some other way? As for the rest: In @keys[$n] = $ENV{$key};, the term @keys[$n] should likely be $keys[$n] (an array element not a slice with one entry), but those should be labeled *values*, not *keys*, shouldn't they?
chas