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REM run the script that sets environment variable FOO 
call foo.bat
...
REM Corion;s suggestion: if you need the entire environment
REM set called by itself dumps one line each VAR=VALUE
set

REM run the script that sets environment variable FOO 
call foo.bat
...
REM my suggestion: send just a few to stdout
echo FOO=%FOO%
echo BAR=%BAR%

use strict;
use warnings;
...
  $sAssignment =~ /^(\w+)=(.*)$/;
  $ENV{$1}=$2;
}