What I am trying to do is ask the user where the file lives, grab the group file, send each cell name in the file to run the.tcl script and if they add a -s or -d switch to the end of the file line the script will run with those switches. When I run the script I get this error message
Global symbol "$opt_s" requires explicit package name at runrv1271.pl line 5. Global symbol "$opt_d" requires explicit package name at runrv1271.pl line 6. BEGIN not safe after errors--compilation aborted at runrv1271.pl line 8.

#!/usr/local/bin/perl -w
#This script will allow the user to run a group of cells using a group file through the .tcl script.

$s = "-use_slopefile 1";
$d = "-dcc 1";

use Getopt::Long;

$groupDir = &promptUser("Enter the entire directory path to your group file.");

GetOptions ('file=s' => \$groupDir,
's=s' => \$s,
'd=s' => \$d);

print "$groupDir\n";

sub promptUser {
my($prompt, $default) = @_;
my $defaultValue = $default ? "$default" : "";
print "$prompt $defaultValue: ";
chomp($input = <STDIN>);
return $input ? $input : $default;
}

open(USERINPUT, "<$groupDir") || die "Sorry, I could not find a group file by that name here. $!\n";

foreach $cell (<USERINPUT>){
chomp $cell;
$ENV{`CLD_RV/rv_char.tcl -cell $cell`);

}
close(USERINPUT);

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