I'm assuming you mean Environment variables when you say "variables from this .cmd file".

If this is the case, you can try to get them thus:

open (CMDFILE,'cmdfile.cmd & SET |' ) or die "Cant run cmd";
 
while(<CMDFILE>){
  print qq(EnvVar:$_)
  ## Look for the variables you want values for
};
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Your perl program will obtain all STDOUT output produced by "cmdfile.cmd" , followed by all available environment variables. This output can now be parsed to get desired info.