Using the shell to redirect the output could be very bad. It's rather insecure and you are relying upon the shell to parse more. For example, this appears to be M$, if $logfile contains any spaces this will fail, you would need:

print system(qq($doscommand > "$logfile"));
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Though I think

#replace . w/ . if 5.6++
open(LOG, '>>'. $logfile);
print LOG qx($doscommand);
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would be better.

--
perl -pe "s/\b;([st])/'\1/mg"