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MAKE_CLASSES:
printf $temporaryLog "%s : Enter loop %d keys ...", scalar localtime()
+, scalar keys %c;
...
     ...
    }
printf $temporaryLog "exited\n";

perl -d:Trace yourscript.pl 2>yourlog

BEGIN{ close STDERR; open STDERR, '>', "$$.log" }
END{ close STDERR; unlink "$$.log"; }