to sort out and print a hash alphabetically based on key:

foreach(sort keys %hash){
  print "$_ ->  $hash{$_}\n";
}
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to sort out and print a hash alphabetically based on value:

foreach(sort {$hash{$a} cmp $hash{$b}} keys %hash){
  print "$_ ->  $hash{$_}\n";
}
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Now specifically to fit your question:

foreach(sort keys %usernames){
  print "$_ $passwords{$_} $bgcolors{$_} $fgcolors{$_}\n";
}
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