The following technique is what I use from time to time to set environment variables using Perl. The shell I am using is bash.

#!/usr/bin/perl -w
# .setenv.pl
use strict;

...
...
my $var1 = 'a';
my $var2 = 'b';
...
...

print <<EOL;
export VAR1=$var1
export VAR2=$var2
EOL

exit(0);
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The .setenv.pl script is called from a shell script, say, .setenv.sh.

#!/usr/bin/bash
if [ -x ~/.setenv.pl ]
then
    eval `.setenv.pl`
fi
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Then you source the shell script with the current shell by:

. ~/.setenv.sh
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This will set the environment variables VAR1 and VAR2 permanently in the current shell.